Red marks on the back are commonly seen in artificial urticaria, atopic dermatitis, fungal infections and other diseases. 1. Artificial urticaria: also known as skin scarring, when the patient’s back skin by friction, pressure and other physical stimuli, the back of the stimulated parts of the red marks or even bulging within a few minutes, in a few hours gradually subside, is a self-limiting disease, there is a tendency to self-cure, itchy symptoms of serious people can be used to loratadine, cetirizine and other antihistamine treatment. 2. Allergic dermatitis: mostly caused by the patient’s contact with allergens, manifested as skin redness, swelling, itching, air masses, etc., such as the patient’s back in contact with pollen, dust mites and other allergens, there will be a red mark, often using antihistamines and glucocorticoid drugs for treatment, such as loratadine, dexamethasone, hydrocortisone and so on. 3. Fungal infection: it is a fungal infectious disease, manifested as erythema, gradually to the surrounding development, ring-shaped, accompanied by itching, often using antifungal drugs for treatment, such as ketoconazole, itraconazole and so on. It is recommended that the appearance of red marks on the back cause discomfort when timely to the hospital, follow the doctor’s instructions for treatment.