Heat rash is prickly heat. In adults, heat rash usually does not require treatment and will subside on its own by staying in a cooler environment, with medication to improve symptoms if necessary. Prickly heat is a common summer skin disease, mainly caused by high body temperature and poor sweat drainage, which can be manifested as blisters, pimples and papules. Prickly heat can be self-healing, usually without special treatment. The most effective way to eliminate it is to let the patient stay in a cool environment, keep the skin clean and dry, and prickly heat will mostly subside on its own. Severe cases can also be treated with medications such as prickly heat powder, glycerite lotion, or oral loratadine to relieve itching. All medications should be used under the guidance of a medical professional to avoid adverse reactions.