Dermatomyositis is a muscle disease that involves inflammation and a skin rash. It is a type of inflammatory myopathy.
Causes, incidence, and risk factors
The cause of dermatomyositis is unknown. Experts think it may be due to a viral infection of the muscles or a problem with the body’s immune system. It may also occur in patients who have cancer in the abdomen, lung, or other parts of the body.
Anyone can develop dermatomyositis. It most commonly occurs in children age 5 – 15 and adults age 40 – 60. Women develop this condition more often than men.
- Problems swallowing
Muscle weakness, stiffness, or soreness
- Purple color to the upper eyelids
- Purple-red skin rash
Shortness of breath
The muscle weakness may come on suddenly or develop slowly over weeks or months. You may have trouble raising your arms over your head, getting up from a sitting position, and climbing stairs.
The rash may appear on your face, knuckles, neck, shoulders, upper chest, and back.
Signs and tests
The doctor will do a physical exam. Tests may include:
Bloods test to check levels of creatine phosphokinase and
- Blood tests for autoimmune diseases
- Magnetic resonance imaging (MRI)
Muscle biopsy Skin biopsy
The disease is treated with anti-inflammatory medicines called corticosteroids and other drugs that suppress the immune system.
When your muscles get stronger, your doctor may tell you to slowly cut back on your doses. Most people with this condition must take a medicine called prednisone for the rest of their lives.
Symptoms may go away completely in some people, such as children.
The condition may be fatal in adults due to severe muscle weakness, malnutrition,
Acute renal failure
- Cancer (
malignancy) Inflammation of the heart Joint pain
- Lung disease
Calling your health care provider
Call your health care provider if you have muscle weakness or other symptoms of this condition.