Heat rash is a common term, clinically known as corn rash. When you have a lot of corn rash in hot weather, you can take general treatment (keep the lesions dry, etc.) and medication (such as topical medication, oral medication, etc.) to treat it. 1. General treatment: you can use a fan or air conditioner to keep the room dry and cool, and wear loose, breathable clothing as much as possible, if the itching is serious, you can also place ice packs in the lesion area to ease the discomfort. 2. Medication: (1) local medication: local use of glycerine lotion, prickly heat powder, etc. to stop itching, relieve discomfort. If the itching is intense and the rash is extensive, hormonal ointment can be applied externally, such as dianabed cream and tretinoin ointment. If secondary infection, antibiotic ointment can be used, such as fusidic acid ointment. (2) Oral medication: if the itching is obvious, you can also follow the doctor’s prescription oral cetirizine, loratadine and other antihistamines. Corns belong to self-limiting disease, but the condition is serious, should consult a doctor in time, follow the doctor’s instructions to standardize the use of drugs.