Juvenile Dermatomyositis (JDM) is an autoimmune condition which means that the immune system which normally protects the body reacts abnormally and becomes overactive in normal tissues. This immune system reaction leads to inflammation (pain/redness/swelling) which can lead to possible tissue damage. In dermatomyositis, the inflammation affects mainly the small blood vessels in muscle (myositis) and skin (dermatitis). This inflammation may cause muscle weakness or pain and skin rashes particularly on the face, eyelids, knuckles, knees and elbows.
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