Abstract
An Unusual Presentation of a Unilateral Asymptomatic Riehl's Melanosis in a 45 Year Old Male
Highlights
Pigmented contact dermatitis (PCD), known as Riehl’s melanosis, is a rare facial hyperpigmentation usually secondary to cosmetics
The patient enjoyed good health and, apart from taking Ginseng as health supplements, no systemic or topical drug-induced pigmentary medication was taken. He had been prescribed topical medications by the practitioners consisted of 4% hydroquinone and topical steroids for the eruption with no improvement He denied using any hair dye or fragrance, but he occasionally used aftershave and the sunscreen provided by his wife
Most authorities agreed that PCD is caused by an allergic contact dermatitis due to a variety of topical and airborne allergens with a mild immune reaction characterized with significant pigmented incontinence, lichenoid vacuolar interface dermatitis and a mild perivascular lymphocytic infiltration [7]
Summary
Pigmented contact dermatitis (PCD), known as Riehl’s melanosis, is a rare facial hyperpigmentation usually secondary to cosmetics. The patient enjoyed good health and, apart from taking Ginseng as health supplements, no systemic or topical drug-induced pigmentary medication was taken He had been prescribed topical medications by the practitioners consisted of 4% hydroquinone and topical steroids for the eruption with no improvement He denied using any hair dye or fragrance, but he occasionally used aftershave and the sunscreen provided by his wife. Most authorities agreed that PCD is caused by an allergic contact dermatitis due to a variety of topical and airborne allergens with a mild immune reaction characterized with significant pigmented incontinence, lichenoid vacuolar interface dermatitis and a mild perivascular lymphocytic infiltration [7] This led to the confusion as to whether the skin pigmentation conditions originally described by Riehl are equivalent to the disease described by subsequent authors. PCD and PCCD are the preferred disease entity practical to dermatologists faced with bizarre facial hyperpigmentation in a clinical setting
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