There is a ring of red on the lip side of the common cause is tongue licking dermatitis, mostly due to dry air caused by the use of petroleum jelly and other emollients. Tongue licking dermatitis is common in children, mostly in the fall and winter, because the air is dry in the fall and winter seasons, children often use their tongues to lick their lips caused by irritant dermatitis. Because licking the lips with the tongue often will lick off the protective barrier around the lips, the skin will become more susceptible to water loss and dryness. Tongue licking dermatitis is commonly characterized by a reddening of the lips, which can be accompanied by pimples, cracks, itching, and pain, which often causes the patient to lick his or her lips more frequently. The key to the treatment of tongue licking dermatitis is prevention, usually can use lip balm, drink more water and other methods to prevent dry lips. Emollients such as petroleum jelly are preferred for treatment after the onset of symptoms. It is recommended that you seek medical attention to identify the cause of the symptoms and follow the doctor’s instructions, do not self-medicate.