Definition of Xanthoma:

Xanthoma is a skin condition in which fat builds up under the surface of the skin.

Causes, incidence, and risk factors:

Xanthomas are common, particularly among older adults and persons with high blood lipids.

Xanthomas vary in size. Some are very small, while others are bigger than 3 inches in diameter. They may appear anywhere on the body, but are most often seen on the elbows, joints, tendons, knees, hands, feet, or buttocks.

They may be a sign of a medical condition that involves an increase in blood lipids. Such conditions include:

• Diabetes
• Primary biliary cirrhosis
• Certain cancers
• Inherited metabolic disorders such as familial hypercholesterolemia

Xanthelasma palpebra is a common type of xanthoma that appears on the eyelids.