Children’s mouth cracked and swollen can take physical therapy and necessary medication, as well as daily care work, if necessary, seek medical attention. 1. Physiotherapy: Early use of ice or cold towel local cold compresses to promote vasoconstriction, improve pain and swelling. 72 hours later, hot compresses can be used to promote blood circulation, accelerate the absorption of swelling. 2. Medication: apply povidone-iodine to sterilize the wound, and then use erythromycin ointment under doctor’s supervision to apply locally, so as to play an antibacterial and anti-inflammatory role. 3. Daily care: keep local hygiene, avoid spicy, irritating food intake, so as to avoid stimulating the local pain, eat more fresh vegetables and fruits, avoid friction, and so on. If the symptoms are serious or do not get better, it is recommended to go to the hospital in time to avoid delaying the condition.