Seborrheic keratoses are skin growths that appear in adulthood. They can be waxy-looking and covered with a dark crust. Although they may be large and grow quickly, they are benign.
Seborrheic keratoses usually appear as slightly raised, light brown spots and evolve into darker, thicker lesions with rough, warty surfaces. If the growths become unsightly, itch, or become irritated from rubbing against clothing, they can be removed.
Seborrheic keratoses tend to run in families, and there are no known ways to prevent them. They are not caused by sun damage, so they may be found on areas both covered and uncovered by clothing. Because of their appearance, seborrheic keratoses can be confused with other skin growths, such as warts, moles, pre-cancer actinic keratoses (AK), or melanoma. See your doctor if you have concerns about the growths.
Seborrheic keratoses are harmless. If treatment is desired, they can be removed. Removal methods include shave biopsy, laser surgery, and curettage and desiccation (C&D).