What is dermatomyositis?
Dermatomyositis is a rare autoimmune disease that causes inflammation in the muscles and skin. The condition can lead to muscle weakness, skin rashes, and fatigue. In some people, it may also affect the lungs, joints, or other parts of the body.
The disease can happen at any age, but it is more common in adults and occurs more often in women. Symptoms may develop gradually or appear more suddenly over time.
The exact cause is not fully understood. Experts believe the condition is related to abnormal immune system activity. In some cases, dermatomyositis may be linked to infections, genetic factors, or other autoimmune diseases.
Symptoms
Dermatomyositis affects people differently, but muscle weakness and skin changes are common signs. Weakness usually affects muscles closest to the center of the body, such as the shoulders, hips, neck, and upper legs.
Symptoms may include:
- Red or purple rash on the face, eyelids, elbows, knees, or knuckles
- Muscle weakness or trouble climbing stairs
- Difficulty lifting objects or standing from a seated position
- Muscle aches or tenderness
- Trouble swallowing
- Fatigue or low energy
- Joint pain or stiffness
- Shortness of breath or coughing
- Weight loss or low-grade fever
- Calcium deposits under the skin
How is it diagnosed?
Healthcare providers diagnose dermatomyositis by reviewing symptoms, medical history, and physical exam findings. Blood tests can help identify signs of muscle inflammation or autoimmune activity.
Additional testing may include imaging studies such as MRI, electrical testing of muscles called electromyography (EMG), and skin or muscle biopsy. Providers may also check for related conditions or complications depending on the patient’s symptoms.
How is it treated?
There is no cure for dermatomyositis, but treatment can help control inflammation and improve strength and daily function. Care plans are personalized based on symptoms and overall health.
Treatment options may include:
- Corticosteroid medications to reduce inflammation
- Immunosuppressive medicines
- Intravenous immunoglobulin (IVIG)
- Physical therapy and guided exercise
- Creams or medicines for skin symptoms
- Sun protection to help prevent rash flare-ups
Some people may need ongoing treatment and regular follow-up visits to manage symptoms and monitor for complications. Early treatment may help reduce muscle damage and improve quality of life.
