Wiktionary
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.