Red rashes on the face after exercise may be caused by cholinergic urticaria, contact dermatitis, folliculitis and other diseases. 1. Cholinergic urticaria: cholinergic urticaria is mainly due to exercise, heat, emotional stress, eating hot drinks or ethanol beverages, the deep body temperature rises, prompting cholinergic nerve impulses and release of acetylcholine, which acts on the mast cells and the onset of the disease. Patients will have symptoms such as wind, erythema, itchy skin and other symptoms, and also panic, irritability and other symptoms. 2. Contact dermatitis: contact dermatitis is caused by skin contact with allergens, the main symptoms of patients are erythema, dense papules, edema, etc., but also itching, blisters, vesicles, burning and other symptoms. 3. Folliculitis: folliculitis is caused by bacteria, fungi and other pathogens infected hair follicles, the patient’s main manifestations of red pimples, itching, tenderness, etc., and in severe cases, fever, chills, headache and other symptoms. Patients appear after exercise the phenomenon of red rashes on the face, should promptly go to the hospital, check the cause of the disease, follow the doctor’s instructions for treatment.