A member asked:

I left astringent on my skin overnight, it left a smooth flat dark mark, what do i do, will it go away, will it scar?

A doctor has provided 1 answer

Hyperpigmentation: Postinflammatory hyperpigmentation (pih) is a frequently encountered problem and represents the sequelae of various cutaneous disorders as well as therapeutic interventions. This acquired excess of pigment can be attributed to various preceding disease processes that affect the skin such as infections, allergic reactions, mechanical injuries, reactions to medications, phototoxic eruptions, trauma.

Answered 7/29/2013

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