Sebaceous carcinoma is a rare form of skin cancer. Normally, cells in the body will grow and divide to replace old or damaged cells. This growth is usually precise. Once enough cells are produced to replace the old ones, normal cells stop dividing. Cancerous tumors occur when there is an error and cells continue to grow uncontrollably. With sebaceous carcinoma, cancer develops in the sebaceous glands (oil glands) of the skin. While it can develop anywhere on the body, it usually grows on the eyelid. However, it can spread (metastasize) if untreated.
Sebaceous carcinoma is easily misdiagnosed and thus is usually only found in its later stages. Successful treatment depends on age, stage and location of cancer, and other factors.