By Gary M. White, MD
The melanoacanthoma is considered a rare variant of a pigmented seborrheic keratosis in which there is a marked increase in the concentration of melanocytes.
A brown or black papule or plaque is typical. In one review of 8 lesions [JAMA Derm 2015;151;1129], the mean patient age was 65 years. Most had other features of a typical SK including a velvety surface, keratotic plugging, and/or a stuck-on appearance. Colors included light or dark brown, black, pink, and gray-blue.
No treatment is needed for this benign lesion. The same therapies as used for the typical seborrheic keratosis may be employed.
A giant melanoacanthoma. Indian J Dermatol. 2011 Jan-Feb; 56(1): 79–81
JAMA Derm 2015;151;1129
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