Mouth ulcers are well, lip pain may be due to lipitis, herpes, allergies, mucosal fibrosis and other conditions of the manifestation, it is recommended to go to the hospital for timely examination and treatment. 1. Frequent licking of the lips or the influence of the environment may lead to flaking of the lips, there may also be chapped pain. 2. A viral infection may cause herpes on the lips, and there may be burning pain before the herpes comes out. 3. Contact with allergy-causing substances, foods or medications can cause allergic reactions on the lips, which may include swelling, breakouts and pain. 4. Those who have the habit of chewing betel nut or smoking for a long time may have the manifestation of mucous membrane fibrosis, which may also occur on the lips, with burning pain.