Dermatomyositis is a rare inflammatory disease that primarily affects the skin and muscles. It is characterized by a distinctive rash, often appearing as purple or red patches on the eyelids and other areas, along with muscle weakness. The exact cause is unknown, but it is believed to involve an autoimmune response, where the body's immune system mistakenly attacks its own tissues. Diagnosis typically involves a combination of clinical evaluation, blood tests for specific markers, and sometimes a muscle biopsy. Treatment often includes corticosteroids and other immunosuppressive medications to reduce inflammation and improve muscle strength. Early intervention can help manage symptoms effectively.