Scratching the body like scraping may be due to urticaria, purpura, eczema and other causes. 1. urticaria: allergic urticaria patients will appear red cloud-like erythema, thus appearing on the body when scratching like scraping. 2. Purpura: hemorrhagic disease, bleeding skin and mucous membranes, bleeding spots, purpura and ecchymosis appear after scratching, thus appearing on the body when scratching like gua sha. 3. eczema: eczema acute stage manifestation for the emergence of erythema-like small papules, skin flushing, fusion into a piece, thus appearing on the body a scratch like gua sha. There are many other reasons for scratching the body like gua sha, the patient should be timely medical treatment, improve the relevant examination to clarify the cause of the disease, under the formal guidance of the doctor treatment.