Unusual Pigmentation on the Skin over Trunk Bones and Extremities

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Abstract
6 young people (19–31 years old) exhibited unusual light or dark brown, ill-circumscribed or reticular pigmentation distributed over protrudent bones. 5 of them have been using nylon towels and scrub brushes for over 3–10 years. Biopsy specimens showed that the amount of melanin granules in the basal layer was increased and melanophages were scattered in the upper dermis. Inflammatory infiltrates were minimal.

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