Excoriations (scratch marks) Redness Bleeding on or around seborrheic keratoses5 Skin Cancer What Causes Skin Barnacles? The precise cause of seborrheic keratosis remains unknown. Experts believe genes play a role, as these growths tend to run in families.6Other factors that may increase your ch...
Seborrheic keratoses usually appear as brown, black or light tan growths on the face, chest, shoulders or back. They have a waxy, scaly, slightly elevated appearance. Some people develop just a single growth, while others have clusters of them. In most cases, seborrheic keratosis first develop...