In autumn and winter, we often see children with “black circles” on the skin around the mouth in dermatology clinics. Parents often complain that because of the dryness of the mouth and lips, the child likes to repeatedly lick the skin around the mouth and lips with his tongue, and as time goes on, “black circles” appear around the mouth and become more and more serious. This phenomenon is medically known as tongue licking dermatitis. During the dry and windy autumn and winter seasons, children’s lips are prone to dryness, cracking and peeling, and they like to lick with their tongues. As the skin around the mouth is repeatedly stimulated by saliva, the surface of the protective layer is lost, more likely to lose water, forming a vicious circle, over time, resulting in tongue licking dermatitis. The skin around the mouth can manifest as erythema, papules, cracking, flaking and other symptoms, the formation of hyperpigmentation over time, the so-called “black circle”, a circle around the mouth, in the shape of a ring, the border is clear, the affected child will feel dry skin around the mouth discomfort. How to treat tongue licking dermatitis? Parents should let their children eat more fresh vegetables and fruits, replenish water, and take vitamin B and vitamin C. More importantly, they should help their children overcome the habit of licking and sucking their lips. For children with poor self-control or severe lesions, they should take some compulsory measures, such as applying some bitter-tasting liquid, such as safranin solution, to the skin around the mouth and lips. . After a period of time, the lesions can subside on their own. If it does not heal, the child needs to go to the dermatology department of the hospital. Doctors usually give the child topical ointments with anti-itching or moisturizing effects, such as compound snake fat ointment, heparin ointment, etc. Those with infections need to use topical or oral antibacterial agents. After eliminating the bad habit of licking and sucking the lips, most children can be cured in about a week. To prevent tongue licking dermatitis, children should drink more water and eat more vegetables and fruits during the dry season. If there is dryness and flaking of the lips and mouth, you can apply some cod liver oil or try a special lip balm for children if available. If the symptoms are more serious, parents should promptly take the child to the hospital for medical attention.