Summer wearing underwear strangulation place itch, consider with physiological factors, pressure urticaria and other related. 1. Physiological factors: the size of the underwear is too small, the underwear is thicker, the sweat absorption and breathability is poor, the pressure of the steel ring underwear, the weather is hot and humid, exercise sweat, the local friction, may lead to local itching. 2. Pressure urticaria: Pressure urticaria, a kind of special induced urticaria, is a common allergic reaction in dermatology, which is related to the stimulation of localized pressure. Pressure on the skin where the underwear strangles may produce itching, burning, pain, and edematous erythema that may last for hours or days. It is recommended that the pressure be relieved and the underwear be replaced with appropriate ones. Usually pay attention to personal hygiene, if necessary, go to the hospital dermatology department, combined with the doctor’s advice standardized treatment.