Post-Inflammatory Hyperpigmentation

Post-inflammatory hyperpigmentation is a dark mark left after skin inflammation has settled.

It can follow acne, eczema flares, insect bites, scratches, burns, or an irritating cosmetic. The colour may range from light brown to deep brown or grey, especially when pigment sits deeper in the skin. PIH is not contagious and does not mean the original trigger is still active.

The usual finding is a flat area of darker colour where a spot, rash, wound, or bite previously occurred. It may appear on the face, chest, back, arms, or legs, and it may be more noticeable after sun exposure. PIH itself is generally not painful or itchy; ongoing itch, scale, tenderness, or swelling suggests that another skin process may still be present.

Dark patches on skin and uneven skin tone are common presentations of post-inflammatory hyperpigmentation, but these symptoms can also have other causes.

Inflammation can stimulate pigment-producing cells and cause melanin to be transferred into nearby skin cells. As the inflammation fades, the skin may remain darker even after the original lesion has healed. Sun and visible light can deepen the contrast, while repeated rubbing, picking, or harsh products can create fresh inflammation.

Common triggers include Acne, Atopic Dermatitis, insect bites, shaving irritation, and cosmetic reactions. The underlying trigger should be controlled alongside any pigment-focused plan.

PIH often fades gradually as pigmented skin cells are shed and pigment is processed. Surface pigment may improve sooner than deeper grey-brown pigment. New marks can appear if acne, dermatitis, bites, or irritation continue, so the overall pattern may seem unchanged even while individual marks are fading.

PIH can affect any skin tone, but the contrast is often greater in medium to deep skin tones. A history of acne or eczema, frequent picking, friction from clothing or shaving, strong sun exposure, and use of irritating products can increase the chance of persistent marks. Previous PIH also signals that future inflammation may leave similar colour changes.

A dermatologist usually diagnoses PIH by examining the colour, shape, location, and relation to an earlier rash or injury. They may ask when the mark began, whether it changes with sun exposure, and which products or medicines touch the area. A closer examination can help distinguish PIH from melasma, an active dermatitis, infection, or another pigmented lesion. Testing is considered when the appearance is atypical or the diagnosis is uncertain.

Treatment is tailored to the trigger, depth of pigment, skin tone, and sensitivity. Daily broad-spectrum sun protection and gentle skincare support every plan. A clinician may prescribe pigment-modulating creams such as Hydroquinone Treatment, Topical Retinoids, or another suitable active. Chemical Peel, Skin Brightening Treatment, or Picosecond Laser Treatment may be considered for selected marks after assessment; procedures can irritate skin and need careful settings and aftercare.

Use a mild cleanser, moisturiser, and sunscreen, and introduce one active product at a time. Avoid scrubbing or picking at healing spots. Progress is easier to judge with consistent lighting and occasional photographs rather than daily mirror checks. Stop a product that causes marked burning, swelling, or a worsening rash and arrange a clinical review.

The main concern is persistent or recurring discolouration, particularly when the cause of inflammation remains untreated. Irritating self-treatment can deepen PIH or cause a new rash. Seek assessment for a mark that bleeds, develops a firm lump, changes in shape or colour, or does not fit the history of a healed inflammatory lesion.

Preventing the original inflammation is the most useful step. Treat acne or dermatitis early, protect healing skin from sunlight, avoid picking, and patch-test new products when practical. Reduce friction from masks, collars, or shaving tools, and choose fragrance-free products if your skin reacts easily.

A dermatologist can confirm whether a dark mark is PIH and build a plan that limits irritation. Specialist review is especially helpful when marks are widespread, repeatedly returning, associated with active acne or eczema, or not improving with gentle care. Bring a list of products and treatments used on the area.