Seborrheic keratosis with an irregular border and a white area that mimics regression in a melanoma. The white surface horn pearls support the diagnosis of seborrheic keratosis.

Seborrheic keratosis. A large, multicolored lesion. Magnification showed scale over the entire surface and black horn pearls imbedded in the dark thick areas.

Seborrheic keratosis. The lesion is black with an irregular notched border. The large, black, surface horn pearls support the diagnosis of seborrheic keratosis.

Seborrheic keratosis. A dome-shaped, black lesion that mimics nodular melanoma. Black surface horn pearls support the diagnosis of seborrheic keratosis.