Prickly heat, also known as corn rash, is caused by poor perspiration. Applying ice packs to prickly heat rash is usually ineffective and may worsen the symptoms. Prickly heat rash tends to occur during the hot summer months, and is considered to be related to the fact that sweat does not drain in time and collects in the skin, causing inflammation of the skin. The skin may appear pinhead-sized red rash, small blisters, with obvious itching sensation. It is recommended not to scratch or irritate to avoid inducing infection, and not to use hot water to avoid aggravation of symptoms. It is not recommended to apply ice packs to patients with milia, as the temperature of ice packs is relatively low, which may cause irritation to the skin, leading to poor subcutaneous blood circulation, which may aggravate the patient’s symptoms. It is recommended to get out of the hot environment and keep the skin dry. If the itching symptoms are obvious, you can use topical glycerite lotion to rub, have the effect of astringent and anti-itching, can help relieve the symptoms. Prickly heat, if necessary, it is recommended to go to the hospital dermatology department, under the guidance of the doctor to standardize the treatment, follow the doctor’s prescription medication.