The child, male, one week and eight months, was admitted to the hospital with “fever and hyposmia for two days”, with a maximum temperature of 39 degrees C. There was no twitching of the limbs, no cough, no runny nose, no vomiting and no diarrhea. Physical examination: T38.5 degrees Celsius, clear, poor mental health, no skin rash on the whole body, red lips and mouth, obvious pharyngeal congestion, two ulcerated spots on the left isthmus. The neck was soft, and no abnormalities were heard in both lungs and heart auscultation. The abdomen was flat and soft, the bowel sounds were normal, and no herpes was seen on the hands and feet. The blood WBC was normal (L: 0.72, N: 0.27) and the stool and urine were normal. Admission consideration: herpetic pharyngitis. He was given ribavirin, antipyretics and other symptomatic treatment. On the morning of the second day after admission, the child’s temperature was normal and a small number of red papules appeared on the head and face. At this time, the child’s family thought it was a drug allergy, and the condition not only did not improve, but worsened, and they were very agitated. The doctor on duty explained that the rash was considered a viral rash and that the possibility of allergy was small, but the family was obviously not satisfied with this explanation. At this point, I came over to the family and carefully analyzed the various possibilities of the rash, such as: measles, infantile emergency rash, rubella are all caused by viruses. The clinical manifestations of many measles are now atypical, but generally there is a high fever at the time of rash, generally three days of prodrome, three days of rash and three days of remission. The rash of infants and young children is usually a fever that subsides. Rubella generally comes out in one day, without hyperpigmentation after remission. Drug allergy is generally systemic, usually a “copper coin” rash. Therefore, it was still considered to be an infantile emergency rash, and the family was asked to observe it for another night. On the morning of the third day after admission, the child’s temperature was normal, a small rash appeared on both lower limbs, and the rash on the face and trunk decreased. The diagnosis of infantile acute rash was further confirmed, and the family was again informed of the condition. This shows that in the current environment where the doctor-patient relationship is tense, the explanation of the patient’s condition is very important, and sometimes the explanation of the condition cannot be generalized, but should be in-depth, but of course the key is to have a good medical foundation. Half of the success of treatment lies in the communication between doctors and patients, especially in this special department of pediatrics, it is more necessary to work on the communication between doctors and patients, and a reasonable explanation is half of the success.