Each growth has a round shape and ranges in size from a millimeter or less to over an inch in diameter. Seborrheic keratoses often resemble warts or moles. Their colors vary, with brown, yellow, and grey being most common. Growths usually begin as small, rough areas, before eventually developing harder, thicker surfaces. Many people describe seborrheic keratoses as having a “stuck-on” or “pasted” appearance because the tumors only involve the topmost layers of skin.

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