Aiposis dolorosa, also known as Dercum's disease (sometimes called Ander's disease), is a rare disease characterized by multiple painful lipomas that arise in adult life. Older medical literature states that "the disease occurs most often in obese postmenopausal women, but can also occur in men." Surveys of current sufferers seem to indicate that the disease causes the obesity. It also occurs in men and women of all ages. The fatty tumors are most often located on the trunk and limbs with sparing of the face and hands. It was first formally described by Francis Xavier Dercum in 1888.