Small rashes all over the body are considered to be allergic purpura, early childhood emergency rash, measles-type or scarlet fever-type drug rash, etc., mainly drug treatment, according to the specific causes of the selection of appropriate drugs. 1. Allergic purpura: It is a kind of allergic reaction capillary and small vasculitis, which can appear in the torso and limbs of the pinpoint to soybean-sized purpura. It is necessary to remove the triggering factors, pay attention to rest, apply glucocorticoid ointment, such as tretinoin, fluoxetine and so on. When the disease is serious, it is necessary to systematically use prednisone and other glucocorticoid drugs. 2. Childhood Acute Rash: Childhood acute rash is common in children under two years of age and starts with a high fever that lasts for three to five days, with a rash appearing after the fever goes down. The disease is caused by viral infections and is self-limiting, requiring symptomatic treatment. If the fever is severe, acetaminophen, ibuprofen and other drugs can be chosen to reduce fever. 3. Measles-type or scarlet fever-type drug rash: This is a common type of drug rash, and most of the symptoms appear after the use of penicillin, sulfonamides or antipyretic drugs. It is necessary to stop the suspected sensitizing drugs immediately, drink plenty of water or intravenous fluids to accelerate the elimination of drugs, and can be treated with oral cetirizine, loratadine and other drugs. In severe cases, the systematic use of methylprednisolone and other drugs is needed. The whole body full of small red rash is a symptom, can not directly diagnose the disease, should be timely to go to the hospital, for the cause of the symptomatic treatment, the specific use of drugs need to comply with the doctor’s instructions, can not be blind treatment.