Dermatomyositis is a rare inflammatory disease. Common symptoms of dermatomyositis include a distinctive skin rash, muscle weakness, and inflammatory myopathy, or inflamed muscles. It’s one of only three known inflammatory myopathies.
Dermatomyositis may occur at any time from infancy through approximately age 80, but most commonly it occurs between ages 40 to 60. The estimated incidence of dermatomyositis is 9.63 cases per million population. In children, the symptoms usually appear between the ages of five to 15 years. Approximately three in 1,000,000 children are affected by juvenile dermatomyositis. Females are affected by dermatomyositis twice as often as males.
There's no cure for dermatomyositis, but periods of remission — when symptoms improve spontaneously — may occur. Treatment can clear the skin rash and help you regain muscle strength and function.