Deep prickly heat, also known as deep corn rash, is a perihidrosis caused by blockage of sweat ducts and subsequent rupture of the surrounding skin due to high temperature and humidity and poor sweat excretion in the skin, commonly occurring in patients with severe and recurrent red corn rash. The lesions are dense, skin-colored blisters that are clear and do not easily break, and increase in size when sweating and decrease in size when not sweating. Deep rash can cause itchy skin, restlessness, and restlessness, which can be exacerbated by sweating or high ambient temperatures. If parents don’t handle it properly, it can become infected and sepsis can occur if the infection is severe. The clinical classification of prickly heat is based on the type of symptoms of the patient: white prickly heat, red prickly heat, and pus prickly heat, except for pus prickly heat, which should be sent to the hospital in a timely manner! Most prickly heat in children grows on the neck and near the forehead. If the heat rash is on the forehead, you can cut the child’s hair short in the summer heat or comb the hair back as far as possible and not leave it on the forehead. If severely necessary, the hair can be shaved to keep it fresh. If a child has a large area of redness, or if the baby has developed a fever or other discomfort, then it is important to take the child to the doctor promptly. Because it may be more than just heat rash, more detailed examination and other treatments are needed.