Dermatomyositis is a non-suppurative inflammatory lesion mainly involving the transverse striated muscle with lymphocytic infiltration, which may or may not be accompanied by a variety of skin lesions. It is characterized by symmetrical weakness of the limb girdle muscles, cervical muscles, and pharyngeal muscles, and often involves a variety of organs, and may be associated with tumors and other connective tissue diseases. What is the prevention of dermatomyositis Gottron’s sign: appropriate use of medication to slow down the hormone to stop this disease is an autoimmune disease, hormone for most patients is an effective therapy, especially in the acute active period for the control of the disease progression is very effective, but the long-term application of a large number of easy to abuse some of the side effects: such as osteoporosis, elevated blood glucose, corticosteroids, peptic ulcer, electrolyte disorders, etc., irregular application (arbitrarily increase or decrease). Irregular application (arbitrarily add or subtract, stop medication, irregular withdrawal, etc.) is very easy to make the disease repeatedly aggravated, and even difficult to treat again, and the disease is easy to relapse, and repeated once aggravated once, increasing the difficulty of a treatment and recovery, therefore, sufferers of the disease with friends should remember: as far as possible under the guidance of experienced specialists who have a high sense of responsibility, the combination of Western and traditional Chinese medicine, according to the step-by-step process, following the law of the occurrence and development of disease, the hormone withdrawal and reduction. The hormone withdrawal and reduction should be carried out under the guidance of experienced and highly responsible specialists. Daily care Daily life conditioning should not be ignored, especially dermatomyositis, such as try to avoid direct sunlight (mainly ultraviolet radiation), go out with a hat, gloves, long-sleeved clothes or umbrella; as far as possible, do not eat seafood (fish, shrimp, crab) and other allergy-prone food; avoid spicy stimulating food (onion, ginger, garlic, etc.); less greasy food; do not eat a full stomach; prohibit smoking and drinking alcohol; do not use cosmetics, Hair dye; avoid contact with pesticides and certain decorative materials; women of childbearing age in the condition is not very stable should be thought to try to avoid pregnancy and abortion, childbirth should be under the guidance of a physician; to ensure adequate sleep, work and rest, to maintain a good mood, moderate exercise, outside the hospital should be followed up regularly for review; and so on, is very helpful to the recovery of the condition and prevention of relapse.