Dermatomyositis

What is dermatomyositis?
Dermatomyositis is one of a group of muscle diseases known as the inflammatory myopathies, which are characterized by chronic muscle inflammation accompanied by muscle weakness.Dermatomyositis’ cardinal symptom is a skin rash that precedes or accompanies progressive muscle weakness. The rash looks patchy, with bluish-purple or red discolorations, and characteristically develops on the eyelids and on muscles used to extend or straighten joints, including knuckles, elbows, heels, and toes. Red rashes may also occur on the face, neck, shoulders, upper chest, back, and other locations, and there may be swelling in the affected areas. The rash sometimes occurs without obvious muscle involvement. Adults with dermatomyositis may experience weight loss or a low-grade fever, have inflamed lungs, and be sensitive to light. Children and adults with dermatomyositis may develop calcium deposits, which appear as hard bumps under the skin or in the muscle (called calcinosis). Calcinosis most often occurs 1-3 years after the disease begins. These deposits are seen more often in children with dermatomyositis than in adults. In some cases of dermatomyositis, distal muscles (muscles located away from the trunk of the body, such as those in the forearms and around the ankles and wrists) may be affected as the disease progresses. Dermatomyositis may be associated with collagen-vascular or autoimmune diseases, such as lupus.

Is there any treatment?
There is no cure for dermatomyositis, but the symptoms can be treated. Options include medication, physical therapy, exercise, heat therapy (including microwave and ultrasound), orthotics and assistive devices, and rest. The standard treatment for dermatomyositis is a corticosteroid drug, given either in pill form or intravenously. Immunosuppressant drugs, such as azathioprine and methotrexate, may reduce inflammation in people who do not respond well to prednisone. Periodic treatment using intravenous immunoglobulin can also improve recovery. Other immunosuppressive agents used to treat the inflammation associated with dermatomyositis include cyclosporine A, cyclophosphamide, and tacrolimus. Physical therapy is usually recommended to prevent muscle atrophy and to regain muscle strength and range of motion. Many individuals with dermatomyositis may need a topical ointment, such as topical corticosteroids, for their skin disorder. They should wear a high-protection sunscreen and protective clothing. Surgery may be required to remove calcium deposits that cause nerve pain and recurrent infections.

What is the prognosis?
Most cases of dermatomyositis respond to therapy. The disease is usually more severe and resistant to therapy in patients with cardiac or pulmonary problems.

What research is being done?
The National Institute of Neurological Disorders and Stroke (NINDS) and other institutes of the National Institutes of Health (NIH) conduct research relating to dermatomyositis in laboratories at the NIH and support additional research through grants to major medical institutions across the country. Currently funded research is exploring patterns of gene expression among the inflammatory myopathies, the role of viral infection as a precursor to the disorders, and the safety and efficacy of various treatment regimens.

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Organizations
American Autoimmune Related Diseases Association
22100 Gratiot Avenue
Eastpointe, MI 48201-2227
https://www.aarda.org
586-776-3900, 800-598-4668

Muscular Dystrophy Association
3300 East Sunrise Drive
Tucson, AZ 85718-3208
https://www.mda.org/
520-529-2000, 800-572-1717

Myositis Association
1737 King Street, Suite 600
Alexandira, VA 22314
https://www.myositis.org
703-299-4850, 800-821-7356

National Organization for Rare Disorders (NORD)
P.O. Box 1968
(55 Kenosia Avenue)
Danbury, CT 06813-1968
https://www.rarediseases.org
203-744-0100, Voice Mail 800-999-NORD (6673)

National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
National Institutes of Health, DHHS
31 Center Dr., Rm. 4C02 MSC 2350
Bethesda, MD 20892-2350
https://www.niams.nih.gov
301-496-8188, 877-22-NIAMS (226-4267)

This information was developed by the National Institute of Neurological Disorders and Stroke, National Institutes of Health

Office of Communications and Public Liaison, National Institute of Neurological Disorders and Stroke, National Institutes of Health. NINDS Dermatomyositis Information Page. Available at: https://www.ninds.nih.gov/health-information/disorders/dermatomyositis. Last accessed April 24, 2023.

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