Dermatomyositis is a connective tissue disease that can lead to itching, including on the back and extensor sides of the limbs. Dermatomyositis is a connective tissue disease that involves the skin and the transverse striated muscle and consists of cutaneous manifestations, myositis manifestations, and other manifestations. Skin manifestations mainly refer to purplish-red erythema of eyelids, Gottron’s papules, heterochromia of skin, V-shaped erythema of scalp anterior chest, scaly erythema of limbs, Raynaud’s phenomenon, photosensitivity and so on. There are no obvious self-conscious symptoms, but according to the individual’s condition, there may be itching or intense itching, especially the back and the extensors of the limbs are suffering from scaly erythema. Dermatomyositis itching suggest timely consultation, under the guidance of the doctor for treatment, daily attention to diet, pay attention to rest, avoid sun exposure.