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Pigment & Tone

Post-Inflammatory Hyperpigmentation (PIH)

Brown marks left behind after acne, injury, waxing, burns or aggressive treatment.

01

What it is

PIH is the flat brown or grey-brown discolouration that remains after inflammation has resolved. It is not a scar — the skin's texture is unchanged, only its colour.

PIH is more common and more persistent in medium to deep skin tones, and can take months to fade without intervention.

02

Why it happens

  • Inflammation stimulates melanocytes to release excess melanin, which is then deposited in the epidermis and sometimes dropped into the dermis.
  • Sun exposure during the healing phase locks the pigment in and deepens it.
  • Picking, over-treating or using irritating actives extends the inflammatory phase.

03

The layer involved

Structure

Epidermis, with dermal deposition in stubborn cases

Superficial PIH clears relatively quickly. When pigment has dropped into the dermis after deeper inflammation, resolution is slower and demands a gentler, longer protocol.

05 · When we may need a medical assessment

Some things belong with a doctor first.

  • PIH following a burn, a device treatment elsewhere, or a reaction to a product.
  • PIH alongside ongoing active acne — the underlying inflammation must be controlled first.
  • Grey-blue discolouration, which can indicate drug-induced or dermal pigment requiring diagnosis.

This page is general education, not medical advice. If anything here sounds like your skin, we will tell you honestly at consultation whether we can help or whether you should see your GP or dermatologist first.

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