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Amyopathic Juvenile Polymyositis Reaserch Causes


Dermatomyositis (DM) is the most easily recognized of the inflammatory myopathies due to its distinctive rash. This rash occurs as a patchy, dusky, reddish or lilac rash on the eyelids, cheeks, and bridge of the nose, and on the back or upper chest, elbows, knees and knuckles. Some people with dermatomyositis develop calcified nodules or hardened bumps under the skin. The rash often precedes muscle weakness.


Muscle weakness usually develops over a period of weeks but may develop over months or even days. The weakness initially affects those muscles closest to and within the trunk of the body, including neck, hip, trunk, and shoulder muscles. Difficulty swallowing occurs in at least one third of DM patients. Whereas less than 25% of adults report muscle pain, more than 50% of children with DM complain of muscle pain and tenderness.

Dermatomyositis can occur at any age from childhood to adulthood and is more common in females than males.

Information for this article was compiled from the National Institutes of Health.


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