Heat rash, known as prickly heat, is a common summer skin disease, mainly due to high body temperature and poor perspiration, mainly manifested as small blisters or pimples on the skin, and some patients may have itchy symptoms. Heat rash is clinically manifested as small blisters or papules, and some patients will have tingling or itching, often appearing on the neck, shoulders, back, chest and other parts of the body. There are four types of heat rash, each with different signs and symptoms. Patients with white prickly heat and deep prickly heat usually have no conscious symptoms such as itching or pain, while patients with red prickly heat and pus prickly heat may feel burning and itching. If you have prickly heat, try to stay in a cool environment and keep your skin clean and dry, and the prickly heat will subside on its own. If prickly heat is more serious, you need to go to the hospital in time.