Prickly heat is a corn rash. Common causes include factors that cause increased sweating and the inability of sweat to be discharged in a timely manner. 1. Factors that cause increased sweating: often in a hot environment, often strenuous sports, such as soccer, basketball, long-distance running, etc., resulting in increased sweating; hyperthyroidism, type I aldosteronism, etc., resulting in increased metabolic rate of the human body, increased sweating; taking Bexarnazol, Neostigmine, and other medications to increase the amount of sweating in the body. 2. Sweat can not be discharged in a timely manner factors: do not pay attention to skin cleansing, pore clogging, resulting in sweat can not be discharged in a timely manner; often wear tight clothing, stickers, etc., may lead to sweat can not be discharged in a timely manner. The human body produces more sweat, sweat can not be evaporated or discharged in a timely manner, gathered within the skin, resulting in the appearance of pinpoint-sized red pimples, pimples and herpes on the skin. If the symptoms are obvious or further aggravated, it is recommended to go to the dermatology department of the hospital for consultation and standardized diagnosis and treatment under the guidance of doctors.