CID, ISM / SCIENCE PHOTO LIBRARY CID, ISM / SCIENCE PHOTO LIBRARY
Sarcoidosis. Close-up of granulomatous lesions on the arm of a 39-year-old female patient with cutaneous sarcoidosis. Sarcoidosis is a rare, chronic disease involving abnormal collections of inflammatory cells that form lumps known as granulomas. It usually begins in the lungs, skin, or lymph nodes. The causes of sarcoidosis may include an allergic response, infection or exposure to certain chemicals. Most patients recover completely without treatment, but corticosteroid drugs can be taken in particularly severe or persistent cases.
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