Cracked lips have been bad can use erythromycin ointment, tretinoin cream and other drugs for treatment, daily to keep the lips moist. Cracked lips refers to lipitis, mainly due to dry skin, skin barrier damage caused by the use of erythromycin ointment, tretinoin cream and other drugs for local application, symptomatic supportive treatment, but also oral vitamins, to help the recovery of the wound. Don’t open your mouth excessively during the treatment period, so as not to cause the wound to split. Drink plenty of water, change the bad habits of biting lips, licking lips, tearing off dry lips, etc. You can use local lip balm to keep the lips moist, avoid the stimulation of the wind and sun, and follow the doctor’s instructions for medication.