Seborrheic keratosis is a common non-cancerous skin growth. It usually appears as a brown, black, or tan growth on the face, chest, shoulders, or back. These growths can vary in size and often have a waxy, scaly, or slightly elevated appearance. While they are typically harmless, they can sometimes be itchy or irritated. Seborrheic keratoses typically develop as people age, and they are more common in older adults. The exact cause is not fully understood, but they are thought to be linked to genetics, sun exposure, and hormonal changes. They are not contagious or harmful, but some people may choose to have them removed for cosmetic reasons or if they become irritated or bothersome.