Prickly heat is a local inflammatory reaction that can manifest itself as small blisters and papules, accompanied by mild tingling, itching, and non-infectious. The common causes of prickly heat are as follows: 1. Sudden change of environment. The outdoor temperature in summer is high, sweating, such as suddenly to the temperature is very low air conditioning room, pores quickly closed, sweat is excited back, easy to grow prickly heat. 2, local skin moisture. The humid environment is easy to breed a lot of bacteria, causing local inflammatory reaction of the skin. 3, a lot of sweating. The ambient temperature is too high, a lot of sweat secretion is not easy to evaporate, resulting in sweat stagnation sweat tube, sweat tube rupture and inflammatory reaction. Usually pay attention to a light diet, do a good job of avoiding the heat, and generally long prickly heat should be dealt with in a timely manner.