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Hyperpigmentation, Postinflammatory

Increase in melanin formation commonly follows acute or chronic inflammatory processes in the skin. Examples include the pigmentation following physical trauma, eczematoid eruptions, lichen simplex chronicus, lupus erythematosus, and dermatoses such as pityriasis rosea, psoriasis, dermatitis herpetiformis, fixed drug eruptions, and photodermatitis. Hyperpigmentation usually fades gradually over a period of months if the involved areas are protected from further ultraviolet exposure. In heavily melanized individuals, though, the disorder may persist for longer periods of time.

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