Heat rash is also known as prickly heat, the two are just called differently, the essence is the same, there is no difference. Heat rash, prickly heat, is an inflammatory skin disease that occurs in summer or in hot and humid environments, and its appearance is mainly related to the blockage of the sweat ducts, especially in infants and young children, which is mainly related to the underdevelopment of the sweat ducts and the high temperature of the environment. Heat rash is characterized by the appearance of small blisters, papules, pimples and pustules on the skin, which may be accompanied by itching and burning pain. Most heat rashes will subside on their own after ventilation and cooling of the environment. If the itching is severe and accompanied by breakouts and infections, it needs to be treated with medication in cooperation with the doctor. It is recommended that babies with heat rashes that do not subside after lifestyle modification should seek prompt medical attention to identify the cause of the rash and undergo treatment under the guidance of a doctor.