Small red rashes around the baby’s mouth may be caused by saliva rash due to increased drooling; atopic dermatitis due to contact with allergic substances; or decreased resistance and infection with herpes simplex virus. It is important to clarify the nature of the rash and give targeted treatment. Small rashes around the baby’s mouth may be saliva rash, usually because of saliva long-term infiltration of the surrounding eczema caused by the need to locally ensure that the skin is dry, minimize the stimulation of saliva. Severe cases can be relieved by applying topical zinc oxide ointment under the guidance of a doctor. If the baby is exposed to allergens and allergic dermatitis, it is necessary to promptly avoid contact with allergens, such as animal hair, etc., to maintain indoor cleanliness and hygiene. If necessary, specific topical fluoride ointment and other relief, or oral loratadine and other anti-allergy drug treatment. If the baby’s immunity is low at this stage, it is easy to activate the latent herpes virus, thus appearing viral herpes in the mouth, at this time, can be used acyclovir ointment topical application, in severe cases, can be taken orally vasiclovir granules and so on. The baby around the mouth with a small red rash may also have other causes, it is recommended to consult a doctor in a timely manner, clear cause targeted treatment.