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NINDS Disorders is an index of neurological conditions provided by the National Institute of Neurological Disorders and Stroke. This valuable tool offers detailed descriptions, facts on treatment and prognosis, and patient organization contact information for over 500 identified neurological disorders.

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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, accompanies, or follows  progressive muscle weakness.  The rash looks patchy, with purple or red discolorations, and characteristically develops on the eyelids and on muscles used to extend or straighten joints, including knuckles, elbows, knees, 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, a low-grade fever, inflamed lungs, and be sensitive to light such that the rash or muscle disease gets worse.  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. 

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.

Prognosis

Most cases of dermatomyositis respond to therapy. The disease is usually more severe and resistant to therapy in individuals with cardiac or pulmonary problems.

Research

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. 

View a list of studies currently seeking patients.

View more studies on this condition.

Read additional information from Medline Plus.

Organizations

American Autoimmune Related Diseases Association

National organization that works to alleviate suffering and the socioeconomic impact of autoimmunity. Dedicated to the eradication of autoimmune diseases through fostering and facilitating collaboration in the areas of education, research, and patient services.

22100 Gratiot Avenue
Eastpointe, MI 48021-2227
Tel: 586-776-3900 800-598-4668
Fax: 586-776-3903

Muscular Dystrophy Association

Voluntary health agency that fosters neuromuscular disease research and provides patient care funded almost entirely by individual private contributors. MDA addresses the muscular dystrophies, spinal muscular atrophy, ALS, Charcot-Marie-Tooth disease, myasthenia gravis, Friedreich's ataxia, metabolic diseases of muscle, and inflammatory diseases of muscle, for a total of more than 40 neuromuscular diseases.

3300 East Sunrise Drive
Tucson, AZ 85718-3208
Tel: 520-529-2000 800-572-1717
Fax: 520-529-5300

Myositis Association

Works to improve the lives of those affected by inflammatory myopathies. Seeks out persons with inflammatory myopathies, provides a support network, acts as a resource for patients and the medical community, advocates for patients, and promotes research into the causes and treatment of the disorders.

1737 King Street
Suite 600
Alexandria, VA 22314
Tel: 703-299-4850 800-821-7356
Fax: 202-466-8940

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
Tel: 301-496-8190 877-22-NIAMS (226-4267)

National Organization for Rare Disorders (NORD)

Federation of voluntary health organizations dedicated to helping people with rare "orphan" diseases and assisting the organizations that serve them. Committed to the identification, treatment, and cure of rare disorders through programs of education, advocacy, research, and service.

55 Kenosia Avenue
Danbury, CT 06810
Tel: 203-744-0100 Voice Mail 800-999-NORD (6673)
Fax: 203-798-2291

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