Seborrheic keratoses are skin growths that appear in adulthood. They may be waxy and covered with a dark crust. Although they can be large and grow quickly, they are benign.
Seborrheic keratoses usually appear as light brown, slightly raised patches and progress to darker, thicker lesions with rough, warty surfaces. If the growths become unsightly, itchy, or irritated by rubbing against clothing, they can be removed.