Seborrheic keratosis (seb-o-REE-ik care-uh-TOE-sis) is a common skin growth. It may seem worrisome because it can look like a wart, pre-cancerous skin growth (actinic keratosis), or skin cancer. Despite their appearance, seborrheic keratoses are harmless. Most people get these growths when they are middle-aged or older. Because they begin at a later age and can have a wart-like appearance, seborrheic keratoses are often called the “barnacles of aging.” It’s possible to have just one of these growths, but most people develop several. Some growths may have a warty surface while others look like dabs of warm, brown candle wax on the skin. Seborrheic keratoses range in color from white to black; however, most are tan or brown.