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melanoacanthoma

n. A benign, darkly pigmented cutaneous condition characterized by a skin lesion with a dull or lackluster surface, and involving a proliferation of keratinocytes and melanocytes.

Wikipedia
Melanoacanthoma

Melanoacanthoma (also known as "Pigmented seborrheic keratosis") is a common, benign, darkly pigmented cutaneous condition characterized by a skin lesion with a dull or lackluster surface.

It involves a proliferation of keratinocytes and melanocytes.