Dermatomyositis 3 years will not be self-cured, the disease is not self-limiting, need to receive regular treatment, treatment includes general treatment, drug treatment, local treatment of skin lesions, etc., after treatment can relieve the condition. 1. General treatment: acute bed rest, in order to prevent atrophy of the limbs, should be moderate exercise, to avoid sun exposure, infection, adults should be actively checked for the occurrence of malignant tumors. 2. Drug therapy: glucocorticoids are preferred; hydroxychloroquine and immunosuppressants such as methotrexate and azathioprine can be added to those with severe conditions. 3. Local treatment of skin lesions: non-specific emollients, shading agents, tacrolimus, pimecrolimus ointment can be used externally. The appearance of dermatomyositis should go to a regular hospital, under the guidance of a professional doctor to choose the appropriate treatment, do not self-medication.