Dermatomyositis is an autoimmune disease, in which the body produces antibodies that attack its own tissues. The disease mainly affects middle-aged women. It is treated with medicines to control inflammation and with physical therapy to help relieve muscle problems.
Some people who have dermatomyositis may get better within a few years. Others may have persistent problems that, in some cases, may affect other organs and become severe.
WebMD Medical Reference from Healthwise