Riehl melanosis is a form of contact dermatitis, beginning with pruritus, erythema, and pigmentation that gradually spreads which, after reaching a certain extent, becomes stationary.
[1]: 857 The pathogenesis of Riehl melanosis is believed to be sun exposure following the use of some perfumes or creams (a photocontact dermatitis).
[1]: 858 Riehl melanosis is named after the dermatologist Gustav Riehl, who first described the condition in 1917.
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