皮肌炎的皮损特点为红斑、水肿,并常出现有肌无力症状和肌肉的炎症、变性的改变。皮肤和血管是该病主要累及的部位,关节、心肌等器官也可出现损害。该病在各年龄段均可以发病,属自身免疫性疾病之一。肌肉和皮肤损害是本病的主要症状。皮肌炎的皮肤损害表现呈多样化,特征性表现为眼眶周围出现的紫红色浮肿性斑,逐渐可累及面颊、前额、颈部、耳部头皮等。肘膝、掌指关节及指间关节伸面出现扁平紫 Dermatomyositis lesions characterized by erythema, edema, and often appear symptoms of muscle weakness and muscle inflammation, degeneration changes. Skin and blood vessels are the main parts of the disease, joints, myocardium and other organs can also be damaged. The disease can occur in all age groups, is one of the autoimmune diseases. Muscle and skin lesions are the main symptoms of this disease. Dermatomyositis showed a variety of skin lesions showed characteristic appearance around the eyes or purple edema, gradually involving the cheeks, forehead, neck, ear scalp and so on. Elbow knees, metacarpophalangeal joints and finger joints face flat purple