Post-inflammatory hyperpigmentation (PIH) is a common skin condition where dark spots or patches appear after the skin heals from an inflammation or injury.

This guide outlines the causes, symptoms, treatment options, and prevention strategies for post-inflammatory hyperpigmentation. We’ll also discuss situations where it may be helpful to consult a dermatologist or aesthetic practitioner.

What is Post-Inflammatory Hyperpigmentation?

Post-inflammatory hyperpigmentation (PIH) occurs when the skin produces excess melanin after an inflammatory event, such as acne, eczema or a cosmetic procedure (e.g., chemical peel or laser treatment).

The condition typically occurs in individuals with darker skin types (Fitzpatrick IV-VI) as their higher melanin levels make them more vulnerable to changes in pigmentation. The pigmentation can vary in hue, ranging from light brown to black and may even manifest as grey or blue in cases of deeper pigmentation.

How Does PIH Develop?

PIH develops when melanin production increases in response to inflammation or injury. The melanocytes in the skin, which produce melanin, become overactive during the skin’s healing process, leading to excessive melanin deposition in the epidermis or dermis. Epidermal PIH (affecting the outer skin layer) often responds differently to management compared to dermal PIH (deeper pigmentation), which may take longer to improve.

Causes of Post-Inflammatory Hyperpigmentation

Different triggers or events can contribute to the development of PIH. These triggers cause overproduction of melanin – the pigment responsible for skin colour. Melanin accumulates in the affected area, leaving behind dark spots or patches. Below are the most common causes of PIH:

1. Acne Vulgaris

Inflammatory acne, particularly in forms like cysts or nodules, is one of the main causes of PIH. Prolonged inflammation from active acne lesions prompts melanocytes – cells responsible for pigment production – to generate excess melanin in the skin. This results in acne marks and PIH, often appearing as dark brown or purple spots.

Individuals with darker skin types may experience persistent facial post-inflammatory hyperpigmentation after acne vulgaris heals.

2. Eczema and Atopic Dermatitis

Chronic skin conditions like eczema and atopic dermatitis often cause frequent skin irritation, leading to intense scratching or rubbing. This mechanical trauma worsens inflammation, causing the skin to produce more melanin in the affected areas. Repeated flare-ups of eczema may also worsen the discolouration.

3. Skin Injuries or Trauma

Physical trauma, such as picking acne and scratching other lesions, cuts, burns, or even insect bites, can initiate an inflammatory response. This response results in excess melanin during the healing process. These injuries, particularly in areas exposed to UV light, can lead to persistent PIH.

4. Allergic Reactions

Allergic reactions that result in skin inflammation, such as reactions to certain skincare ingredients or environmental allergens, can also lead to PIH.

5. Some Cosmetic Procedures (Laser Treatments and Chemical Peels)

Cosmetic procedures like laser therapy and chemical peels, if not correctly administered, may sometimes worsen PIH. Incorrect use of skin treatments, such as intense pulsed light (IPL) or aggressive peels, can cause further irritation. To minimise risk, consult a medical or aesthetic practitioner before undergoing these procedures.

Risk Factors of PIH

Certain individuals are more susceptible to developing PIH because of pre-existing conditions or environmental factors that increase their likelihood. Understanding these risk factors is important, as they highlight why some individuals may be more prone to PIH and can guide preventive measures.

1. Due to their naturally higher melanin baseline levels, darker skin tones are at a higher risk of developing PIH. In these skin types, inflammation triggers an overactive response in melanocytes (melanin-producing cells), leading to more intense and prolonged pigmentation. 

2. Sun exposure is a significant contributor to PIH, as UV radiation stimulates melanocytes, darkening existing hyperpigmented spots and potentially triggering new ones. Studies show that consistent use of broad-spectrum sunscreen with SPF 30 or higher may help reduce the risk of further darkening, especially in individuals already prone to hyperpigmentation.

3. Genetic predisposition to inflammatory skin conditions, such as lichen planus and atopic dermatitis, increases the risk of developing PIH. Genetics influence how the skin responds to injury and inflammation, leading to increased melanin deposition during the healing process.

4. Persistent Inflammatory Skin Conditions: These conditions frequently cause irritation, and repeated flare-ups can result in PIH that may be more persistent. Managing these underlying skin conditions, through medical care or consistent skincare, may help lower the likelihood of PIH.

5. Improper handling of acne and skin injuries can worsen PIH. Picking or scratching at acne lesions can aggravate the inflammatory process, leading to more severe hyperpigmentation. Using aggressive skin treatments or applying products unsuitable for one’s skin type can also trigger or worsen PIH​.

Symptoms of PIH

The symptoms of PIH appear as dark spots or discoloured patches on the skin after an inflammatory episode. These spots can vary in size, shape and colour depending on the severity of the original inflammation and the depth of the pigmentation.

Key symptoms include:

• Dark spots at the site of healed acne, eczema, or other skin injuries
• Persistent patches of discolouration, ranging from light brown to black (depending on the skin tone and depth of pigmentation).
• Worsening of pigmentation with further UV exposure

Types of Post-inflammatory Hyperpigmentation

Post-inflammatory hyperpigmentation (PIH) can be classified into three types based on the depth of melanin deposition in the skin: epidermal, dermal, and mixed. Understanding the classification can help explain why different approaches may be recommended for PIH.

1. Epidermal PIH

This type occurs when excess melanin is deposited in the epidermis, the outermost layer of the skin, and usually presents as brown or dark brown spots. Because the pigmentation is more superficial, epidermal PIH may be managed with topical agents such as hydroquinone, glycolic acid, salicylic acid, or azelaic acid.

2. Dermal PIH

Dermal PIH involves melanin deposition in the dermis, the layer beneath the epidermis. It typically appears as blue-grey or dark brown discolouration. Severe skin inflammation can cause melanin to be released into the deeper layers. Because of its depth, dermal PIH may not respond as well to topical agents, and some individuals may seek professional procedures such as laser therapy for management.

3. Mixed PIH

This condition combines epidermal and dermal pigmentation, presenting as patches that can appear brown, grey, or blue. Management may involve both topical treatments for superficial pigmentation and procedures such as laser therapy for deeper pigmentation.

Treatment Options for PIH

PIH may be managed through various methods, depending on the depth and extent of the pigmentation. Below are the primary categories often discussed in clinical and skincare contexts:

1. Topical Treatments

Topical agents are commonly used to manage PIH, particularly in its early stages. Common topical treatments include:

• Azelaic acid: Has anti-inflammatory properties and is used in the management of pigmentation and acne.
• Kojic acid: Inhibits melanin production and is used in the management of epidermal hyperpigmentation.
• Topical retinoids: Support skin cell turnover and may help improve pigmentation.
• Vitamin C: An antioxidant used to support skin health and protect against environmental stressors.

2. Medical and Dermatological Procedures

Medical procedures may sometimes be considered for more pronounced PIH. These include:

Chemical peels: Using glycolic or salicylic acid to exfoliate the skin’s surface, which may improve the appearance of epidermal PIH. Caution is advised in darker skin types as they may increase pigmentation risk.

Pico Laser treatments: Target pigmented skin cells and may help break down excess melanin. Some lasers can worsen pigmentation if used incorrectly, so professional guidance is important.

If you think you might have post-inflammatory hyperpigmentation, we recommend booking an appointment with Dr Kellyn Shiau to find a suitable treatment for your condition.

Preventing Post-inflammatory Hyperpigmentation

Prevention is always better than a cure. A consistent skincare routine and protective measures can help reduce the likelihood of developing PIH. This includes:

• Daily use of sunscreen with SPF 30 or higher. Reapply throughout the day for optimum sun protection. 
• Avoid picking or scratching acne, eczema or other skin lesions
• Use gentle skincare products with anti-inflammatory ingredients
• Opt for gentle exfoliants like glycolic acid to promote cell turnover

Complications and Long-term Effects of PIH

If not properly treated or managed, post-inflammatory hyperpigmentation may last for months or even years, and in some cases can persist for longer periods. Sun exposure without protection may further darken the affected areas, making the discolouration more noticeable.

When to See a Medical Practitioner for PIH

It’s important to consult a medical practitioner when:

• The pigmentation persists for several months without improvement.
• Over-the-counter products do not appear to improve the pigmentation, or the discolouration seems to worsen.
• You’re uncertain about the cause of the pigmentation and need a diagnosis.
• The pigmentation is extensive or deep.

Book a consultation with Lux Medical Aesthetic Clinic to explore your treatment options and receive professional advice on managing PIH.

Conclusion

Managing post-inflammatory hyperpigmentation can take time, and outcomes vary depending on individual factors. Understanding the causes, risk factors, and treatment options is essential for managing and preventing PIH. If this condition persists, consulting a medical professional may provide helpful guidance and support.

One possible cause could be hypopigmentation — a condition where the skin loses some of its natural colour.

Hypopigmentation can feel confusing and concerning, especially when you’re unsure what’s behind the change. Understanding more about this condition is a helpful first step in managing your skin health.

With the right information, you can better understand what may be contributing to the changes in your skin tone and explore ways to support its overall health.

In this article, we’ll explain the different types and possible causes of hypopigmentation. You’ll also learn about commonly used treatment approaches and steps that may help maintain healthy skin.

What is Hypopigmentation?

Hypopigmentation is a skin condition that occurs when the skin produces less melanin. This results in patches that appear lighter than the surrounding areas, but they’re not completely without pigment. A number of factors can lead to hypopigmentation, including genetic conditions, skin injuries, inflammation, or certain medical treatments. It can affect small areas or appear more widely across the skin.

How Does Hypopigmentation Occur?

Hypopigmentation happens when melanocytes, the cells responsible for producing melanin, are reduced or damaged. In some cases, genetic conditions like albinism can affect melanin production. For example, a deficiency in an enzyme called tyrosinase may result in very little or no melanin being produced.

In conditions like vitiligo, the immune system may mistakenly attack and destroy melanocytes. This leads to areas of skin that lose their pigment. Inflammatory skin can also interrupt how melanin is passed from melanocytes to other skin cells, which may result in lighter patches.

Environmental factors like UV radiation can also affect how melanocytes work. While some sun exposure normally triggers melanin production, excessive UV damage may cause these pigment-producing cells to break down or die, reducing overall melanin in the skin.

Altogether, a mix of genetic, immune-related, inflammatory, and environmental factors can contribute to the development of hypopigmentation.

Types of Hypopigmentation

Hypopigmentation can be classified into several types depending on its extent and cause. Here are some of them:

1. Localised Hypopigmentation

This type affects specific areas of the skin. Common examples include:

• Vitiligo. An autoimmune condition where the body attacks melanocytes, leading to the appearance of white patches on the skin.
• Halo naevus. A mole surrounded by a ring of depigmented skin.
• Post-inflammatory hypopigmentation. This occurs after skin trauma or inflammation, such as eczema, psoriasis or burns. It can also happen if you have been exposed to certain chemicals, like cleaning agents or chemicals used in removing tattoos.
• Idiopathic guttate hypomelanosis. Small, white spots usually appear on the arms or legs. This is common in ageing skin.
• Pityriasis alba. This is characterised by round or oval light patches, often seen in children with eczema.
• Pityriasis versicolor or tinea versicolor. A fungal infection caused by Malassezia species, resulting in scaly, discoloured patches on the skin.

2. Generalised Hypopigmentation

Generalised hypopigmentation refers to a reduction in skin pigment that affects large areas of the body, resulting in noticeably lighter skin. It can result from either genetic or acquired conditions. The way it appears often depends on the underlying cause.

Albinism is the most common form of generalised hypopigmentation. It is a genetic condition where the body produces little or no melanin, the pigment that gives colour to the skin, hair and eyes.

3. Iatrogenic Hypopigmentation

Iatrogenic hypopigmentation refers to skin lightening due to medical treatment or intervention that inadvertently damages melanocytes, leading to a loss of skin colour in the affected areas. Some of the common causes of this condition include:

• Chemical peels. Improperly administered chemical peels can damage the skin and melanocytes, resulting in lighter patches.
• Laser treatments. While commonly used to treat various skin conditions, lasers can sometimes cause hypopigmentation if the treatment is too aggressive or not tailored to the individual’s skin type.

Treatment Options for Hypopigmentation

Treatment options vary depending on the severity of the condition and the underlying causes of hypopigmentation.

Topical Treatments

Topical treatments for hypopigmentation are sometimes used to improve skin appearance in affected areas. The type of treatment depends on the underlying cause and the severity of the condition.

• Corticosteroids. Topical corticosteroids can reduce inflammation and may help restore pigmentation.
• Topical calcineurin inhibitors. These suppress immune activity that may damage melanocytes. They can help reduce inflammation and may slow pigment loss in conditions such as vitiligo.

Phototherapy

Phototherapy typically involves using ultraviolet (UV) light to stimulate melanocyte activity and promote repigmentation in the hypopigmented area.

• PUVA (Psoralen Plus Ultraviolet A). This treatment combines psoralen, a light-sensitive medication, with UVA light. Psoralen may be taken orally or applied topically before UVA exposure to increase the skin’s sensitivity to light and encourage melanin activity.
• UVB Therapy. This method uses a specific wavelength of UVB light that stimulates melanin production in the skin. It is commonly used for conditions like vitiligo and can help restore colour to hypopigmented patches. 

Cosmetic Procedures

Cosmetic procedures for hypopigmentation are sometimes considered to improve the appearance of lighter skin patches that may develop from causes such as injuries, inflammation or earlier treatments.. Here’s a detailed overview of the most common cosmetic procedures used to address hypopigmentation:

• Microneedling. It involves using a device with fine needles to create micro-injuries in the skin. This process stimulates collagen synthesis and potentially enhances melanin production in hypopigmented areas.
• Skin grafting. A surgical method where skin is transferred from another area of the body to a hypopigmented patch. This approach may be considered in certain cases to help reduce visible contrast in skin tone.
• Micropigmentation. Sometimes referred to as medical tattooing, this technique applies pigment to the skin to help reduce the visibility of lighter patches.

A qualified doctor can advise on whether these procedures are suitable for your condition and discuss the potential risks and benefits.

Preventive Measures for Hyperpigmentation

Taking proactive steps can can help lower the risk of hypopigmentation or reduce its visibility.

1. Use Sun Protection

UV rays may make hypopigmentation more noticeable by increasing the contrast between affected and unaffected skin.

• Avoid direct sun exposure, particularly during peak hours (10 am to 4 pm).
• Use a high-SPF, broad-spectrum sunscreen daily and reapply it throughout the day.
• When outdoors, wear protective clothing such as hats and long-sleeved shirts.

2. Establish a Gentle Skin Care Routine

• Use moisturisers to maintain skin hydration.
• Avoid harsh exfoliants and treatments that may irritate the skin and worsen hypopigmentation.

3. Manage Underlying Conditions

While some conditions, such as albinism and certain genetic disorders, do not have cures, managing symptoms and taking protective measures can support skin health and comfort.

• Treat infections or inflammatory conditions that may be causing or worsening the issue.
• Regular visits to your doctor can help with monitoring and management.

4. Adopt Healthy Lifestyle Adjustments

Healthy lifestyle choices can support overall skin health. Eating foods rich in antioxidants, vitamins and minerals, staying hydrated, avoiding smoking and limiting alcohol intake are positive steps for maintaining skin balance.

Hypopigmentation vs. Hyperpigmentation

The difference between hypopigmentation and hyperpigmentation comes down to melanin levels in the skin. Hypopigmentation results from reduced melanin, which creates lighter skin patches. Hyperpigmentation occurs when excess melanin leads to darker spots.

Both conditions affect skin appearance and may be of concern to some individuals. Lighter and darker areas can also be more sensitive to sun exposure, which makes sun protection important for people affected by these conditions.

How is hypopigmentation diagnosed?

Diagnosis may involve taking a family history, performing a physical examination and running tests to find the underlying cause. In some cases, a skin biopsy may be done to check melanin levels.

Can hypopigmentation affect my appearance?

Hypopigmentation can cause visible light patches on the skin, which may affect overall skin tone and appearance.

Does hypopigmentation go away on its own?

In some cases, hypopigmentation may improve on its own, such as when it follows an injury or inflammation. However, types related to genetic conditions or autoimmune disorders, such as vitiligo, usually do not resolve without medical intervention.

What are the risks associated with hypopigmentation?

Possible risks include long-term colour changes and emotional distress related to appearance. Areas of hypopigmented skin may also be more sensitive to UV radiation because of reduced melanin, so sun protection is recommended.

Conclusion

Management of hypopigmentation depends on the underlying cause and individual needs. Options such as topical therapies, phototherapy and cosmetic procedures may be considered in some cases. Preventive care, including sun protection and maintaining skin health, also plays an important role.

While some cases resolve naturally, others may require ongoing management. Consulting with a qualified aesthetic practitioner ensures the best action for addressing any concerns related to this condition. 

Freckles are a common skin feature that many people have, but not everyone understands what they are or how they form. While some see freckles as unique and beautiful, others seek ways to reduce their appearance. In this article, we’ll explore everything you need to know about freckles, from their causes to the various treatment options available for you.

What are Freckles?

Freckles are small, dark spots on the skin, often appearing as tan, brown or red. While they’re not harmful, they are commonly a feature of one’s complexion and vary in size, colour and distribution.

Causes of Freckles

Genetic Factors

The formation of freckles is strongly influenced by a person’s genetics. People with fair or light skin colour, blond or red hair, and light-coloured eyes are more likely to develop freckles. The tendency to freckle is inherited, particularly through the melanocortin-1 receptor (MC1R), which affects melanin production in the skin.

Sun Exposure

Freckles often develop in response to sun exposure, as UV rays trigger the skin to produce more melanin as a protective response. It is why freckles are commonly found on sun-exposed skin, such as the face, arms, neck, and back. Freckles also tend to be more prominent in the summer and may fade when sun exposure is reduced, such as during autumn or winter.

Types of Freckles

Here are two types of freckles.

Ephelides

Ephelides are the classic freckles often associated with fair skin and red or blonde hair. They appear primarily due to sun exposure and can fade in the winter. These flat freckles are red or light brown and are commonly seen in people of European or North and East Asian descent.

Lentigines

Also known as age or liver spots, these freckles typically present as larger and darker brown spots than ephelides. They are associated with prolonged sun exposure and tend to appear as individuals age, particularly after 40, and do not fade with the seasons.

Freckles vs Sunspots

Although freckles and sunspots might appear similar, they differ in origin and appearance.

• Freckles are genetic and tend to fade without sun exposure.
• Sunspots (solar lentigines or age spots) result from prolonged sun exposure and are typically larger and more defined than freckles. Sunspots also tend to persist longer and not fade as easily when sun exposure is reduced.

Freckles vs Moles

It’s important to distinguish between freckles and moles, as they have different implications for your health.

• Freckles are flat, light brown, and generally harmless.
• Moles can be flat or raised. They vary in colour and could become cancerous, especially if they change in size, shape or colour over time.

Treatment Options for Freckles

Several options exist for individuals considering treatments to reduce the appearance of freckles. Below is an overview of some methods available:

1. Topical Treatments

Topical creams and acids can help lighten freckles over time. Common ingredients include alpha-hydroxy acid (AHA), hydroquinone and retinoid, which promote skin cell turnover and reduce pigmentation.

2. Chemical Peels

The chemical peel procedure involves applying a solution to exfoliate the top layer of the skin and reveal newer, less pigmented skin beneath. This treatment can reduce the appearance of freckles but may require multiple sessions.

3. Laser Treatment

Laser treatment targets the melanin in freckles, breaking it down so the body can naturally remove it. This treatment may require several sessions for the desired results.

4. Intense Pulsed Light (IPL)

IPL uses pulses of light to target pigmentation in the skin and reduce the appearance of freckles. It is typically less aggressive but may require more sessions before freckles become less noticeable.

When to Seek Medical Advice

If you notice any changes in your freckles, such as an increase in size, a change in colour, or irregular borders, it’s crucial to consult a doctor. Regular skin checkups are important if you have many freckles to help catch any potential issues early.

Conclusion

Freckles are a common facial feature, especially in individuals with lighter skin tones. While they’re usually harmless, being informed about their causes and the treatments available for you can assist in skin care decisions. If you’re ever in doubt, consult a doctor for advice on how to best care for your skin and monitor any changes.