Seborrheic keratoses: Signs and symptoms

Seborrheic keratoses tend to:

Start as small, rough bumps, then slowly thicken and develop a warty surface
Have a waxy, stuck-on-the-skin look
Be brown, though they range in color from white to black
Range in size from a fraction of an inch to larger than a half-dollar
Form on the chest, back, stomach, scalp, face, neck, or other parts of the body (but not on the palms and soles)
Cause no pain, though some itch

Seborrheic keratoses can look like stucco splattered on the skin.

Like his father, this man developed many of these growths on his skin.

Images Images used with permission of the American Academy of Dermatology National Library of Dermatologic Teaching Slides.