Picture of Dermatofibroma
Dermatofibroma. Also called benign fibrous histiocytoma, a dermatofibroma is a non-cancerous fibrous nodule that can occur anywhere on the body, but are more commonly found on the arms, legs and upper back. In most cases, they are small and have no symptoms but in rare cases skin cancers may develop within a dermatofibroma.
Text Source: National Library of Medicine
American Osteopathic College of Dermatology