Inflammatory myositis (or myopathy) is an autoimmune disease in which the body attacks its own soft tissues, including muscles and tendons. Myositis can sometimes be the result of a viral infection or reaction to a medication.
There are 4 main types of inflammatory myositis - polymyositis, dermatomyositis, inclusion body myositis, and necrotizing autoimmune myopathy.
Polymyositis – affects skeletal muscles.
Dermatomyositis – affects blood vessels that supply blood to muscle and skin. Often causing rashes, rough or scaly skin and small painful bumps under the skin.
Inclusion Body Myositis – produces progressive muscle weakness in arm and/or leg muscles.
Necrotizing Autoimmune Myopathy – affects the lower and/or upper body. Symptoms appear more suddenly and are often severe.
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