👉 A fibroma is a type of benign tumor, usually found in the skin or on the underlying layers of the body. A fibroma can be caused by various factors, including genetics, exposure to certain chemicals, and stress. The exact cause of fibroma remains unclear, but it is thought to be related to an abnormal growth of cells in the skin called keratinocytes. These cells are responsible for producing proteins that make up the skin's outer layer of cells called the stratum corneum