Itching on both sides of a man’s thighs may be caused by ringworm, eczema and other diseases. 1. ringworm: ringworm refers to the occurrence of ringworm infection in the groin, perineum, perianal and buttocks and other parts of the skin, is a relatively common clinical infectious diseases, mainly manifested as erythema, pimples, blisters, dandruff and other skin lesions, accompanied by itchy symptoms, the patient’s thighs itchy side may be caused by ringworm. 2. eczema: eczema is a common dermatological disease, due to the thigh area skin warm, moist, and exercise, walking, thigh skin and pants friction, may induce eczema, which leads to thighs on both sides of the red macules, scales, and other skin damage, accompanied by more obvious itching. In addition, hives, mosquito bites, contact dermatitis and other factors may also cause itchy thighs, it is recommended that the patient timely medical examination, to clarify the cause of the targeted treatment.