Post-inflammatory hyperpigmentation can be frustrating because the rash or acne may be gone while the dark mark stays behind. These flat brown, gray-brown, or darker-than-your-normal-skin-tone areas are not scars in the traditional sense. They are pigment changes that develop after inflammation.
Why do dark spots appear after a rash or breakout?
Inflammation can stimulate melanocytes—the cells that make pigment—to produce or distribute more melanin. Once the inflammation settles, that extra pigment can remain in the epidermis or, in some cases, deeper in the dermis. The result is post-inflammatory hyperpigmentation, often shortened to PIH.
PIH can follow many common skin problems, including acne, eczema, insect bites, allergic reactions, folliculitis, burns, picking, or irritation from skin-care products. Treating the original condition matters because ongoing inflammation can keep producing new pigment.
Why is post-inflammatory hyperpigmentation more noticeable in melanin-rich skin?
Anyone can develop PIH, but it tends to be more prominent and longer-lasting in people with darker skin tones. A recent systematic review focused on skin of color found that PIH is common, often persistent, and can be challenging to treat. This is one reason dermatologic care should account for both the underlying skin condition and how pigment may respond afterward.
At Borealis Dermatology, our dermatology for melanin-rich skin approach emphasizes diagnosis, inflammation control, and treatments chosen with pigmentary risk in mind.
Will dark spots fade on their own?
Many do, but the timeline can be slow. Superficial pigment may gradually improve over months, while deeper pigment can last much longer. Sunlight and visible light can also darken existing areas and make them more noticeable.
The American Academy of Dermatology notes that sun protection can help prevent and fade dark spots in darker skin tones. AAD guidance specifically discusses tinted broad-spectrum sunscreen with iron oxide as an option that can help protect against visible light, which may contribute to hyperpigmentation.
What can help post-inflammatory hyperpigmentation fade?
The first step is to stop the cycle of new inflammation. Acne, eczema, or another rash that is still active should be treated directly. Once the trigger is controlled, a dermatologist may consider a combination of sun protection and topical treatments selected for your skin type and the depth of pigment. Learn more about Borealis Dermatology’s treatment for dark spots, melasma, and uneven skin tone.
Options may include retinoids, azelaic acid, hydroquinone in selected situations, or other pigment-targeting ingredients. A systematic review of topical PIH treatments found the strongest evidence among several commonly used approaches for retinoids, hydroxy acids, and broad-spectrum sunscreen, although the best plan depends on the individual patient.
Can peels or lasers make dark spots worse?
They can if the treatment itself creates too much inflammation. Chemical peels, lasers, and other procedures may be useful for selected patients, but overly aggressive treatment can trigger additional PIH—especially in skin that is more prone to pigment change. For selected patients interested in cosmetic treatment of residual discoloration, options may also include services through the Borealis Medispa or carefully selected laser treatments such as Clear + Brilliant / Permea. These procedures are not appropriate for every type of hyperpigmentation or every skin tone. The safest approach is not simply to use the strongest treatment; it is to match the treatment to the diagnosis, skin tone, and risk of additional inflammation.
What should I avoid?
- Picking or scratching healing acne, bites, or rashes
- Layering multiple irritating acids or exfoliants at once
- Using bleaching products from unverified sources
- Skipping sunscreen because your skin rarely burns
- Trying to treat discoloration before controlling active inflammation
When should I see a dermatologist?
See a dermatologist if pigment is spreading, changing quickly, associated with an active rash, or not improving despite consistent skin care. It is also worth getting evaluated when you are not sure whether a spot is truly PIH. Melasma, medication-related pigmentation, lichenoid conditions, fixed drug eruptions, and some other disorders can look similar.
Borealis Dermatology sees patients in Garden City, Syosset, and Bellerose. Book Appointment for an individualized treatment plan.
Trusted Sources & Related Reading
- PubMed: Treatment of post-inflammatory hyperpigmentation in skin of colour
- American Academy of Dermatology: How to fade dark spots in darker skin tones
- PubMed: Topical treatment for post-inflammatory hyperpigmentation
This article is for general educational purposes and is not a substitute for an individual medical evaluation.