Dermatomyositis. There are no preventive measures for dermatomyositis which is an autoimmune disease that affects skin and muscles. Dermatomyositis follows a viral illness or as autoimmune entity . In few patients it is present with cancer. It also affects lungs, heart and esophagus . It also overlaps at times with lupus. Scleroderma and sjogren's . Diagnosis by muscle /skin biopsy.
No. It is an autoimmune disease that cannot be prevented if it is going to manifest itself.
No. It is unclear what causes dermatomyosistis. It must be treated by rheumatologist with internal medications steroids and possibly other drugs in combination.