Incidence of<unk>  peaks at ages 40–50, but the disease can affect people of all ages. It tends to affect more women than men. The prevalence of<unk>  ranges from one to 22 per 100,000 people.
Dermatomyositis
Scleroderma
Inclusion body myositis
Polymyositis
Scleromyositis
Dermatopolymyositis
Trichinosis
Juvenile dermatomyositis