A hot rash on the face of a baby doll in the month is usually caused by diseases, such as red corn rashes and eczema, etc. The causes of the disease are different, and the treatments are different. 1. Red Corn Rash: A newborn baby with a heat rash on his face in the month may be caused by red corn rash. The disease is common in summer, due to the hot and stuffy environment, the child sweats too much, easy to lead to poor skin perspiration, the appearance of round pinpoint-sized dense papules, surrounded by a red halo. It is recommended that the child be placed in a cool environment, topical glycerine lotion, etc.; children crying due to itching is serious, oral antihistamines can be taken under the guidance of a doctor. 2. Eczema: the cause of this disease is not yet clear, may be related to genetics, allergens, environment and so on. Breastfeeding mothers are advised to avoid spicy and stimulating foods, eat a light diet, adjust the room temperature to a comfortable temperature, and at the same time use topical glycerine lotion or glucocorticosteroid creams such as hydrocortisone butyrate cream under the guidance of a doctor. Parents are advised to bring their newborns with heat rashes to regular hospitals to get a clear diagnosis of the cause of the disease and standardized treatment as prescribed by the doctor.