A lipoma is a common, benign tumor composed of fatty tissue. Lipomas are soft to the touch, sometimes moveable, and are generally painless. They grow very slowly, and have not been found to become cancerous (malignant liposarcoma, however, also arises from fatty tissue). Many lipomas are small but can enlarge to sizes greater than six centimeters. Lipoma is commonly found in adults from 40 to 60 years of age but can also be found in children. 1/100 of the general population has a lipoma.citation needed]