Author: Vanessa Ngan, Staff Writer, 2003.
A lipoma is a non-cancerous tumour that is made up of fat cells. It slowly grows under the skin in the subcutaneous tissue. A person may have a single lipoma or may have many lipomas. They are very common.
Lipomas can occur in people of all ages, however, they tend to develop in adulthood and are most noticeable during middle age. They affect both sexes equally, although solitary lipomas are more common in women whilst multiple lipomas occur more frequently in men.
The cause of lipomas is unknown. It is possible there may be genetic involvement as many patients with lipomas come from a family with a history of these tumours. Sometimes an injury such as a blunt blow to part of the body may trigger growth of a lipoma.
People are often unaware of lipomas until they have grown large enough to become visible and palpable. This growth occurs slowly over several years. Some features of lipomas include:
Most lipomas are symptomless, but some are painful on applying pressure. Lipomas that are tender or painful are usually angiolipomas. This means the lipoma has an increased number of small blood vessels. Painful lipomas are also a feature of adiposis dolorosa or Dercum disease.
Diagnosis of lipoma is usually made clinically by finding a soft lump under the skin. However, if there is any doubt, a deep skin biopsy can be performed which will show typical histopathological features of lipoma and its variants.
The rare fatty cancer, liposarcoma, almost never arises in the skin. Liposarcoma is a deep seated tumour, and most often grows on thigh, groin or at the back of the abdomen. If your lipoma is enlarging or becomes painful, check with your doctor. A skin biopsy may be required to exclude liposarcoma.
Most lipomas require no treatment. Most lipomas eventually stop growing and remain indefinitely without causing any problems. Occasionally, lipomas that interfere with the movement of adjacent muscles may require surgical removal. Several methods are available:
Book: Textbook of Dermatology. Ed Rook A, Wilkinson DS, Ebling FJB, Champion RH, Burton JL. Fourth edition. Blackwell Scientific Publications.
See the DermNet NZ bookstore.
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