Histology shows epidermolytic hyperkeratosis. Usually solitary resembling a wart on the head and neck of middle-aged to elderly patients. Histology shows suprabasilar clefting, acantholysis, dyskeratosis, and keratinous plug. Acantholytic acanthoma Solitary tumor on trunk of older patients. Multiple lesions may be seen in renal transplant patients.
Histology shows hyperkeratosis, papillomatosis, acanthosis, and variable acantholysis.
Dermatosis papulosa nigra May be a variant of seborrheic keratosis. Almost always found on head and neck area in black females. Histologically resembles the reticulate variant of seborrheic keratosis. Melanoacanthoma Pigmented nodule occurring on the trunk and head and neck of older patients. Histologically resembles a pigmented seborrheic keratosis.