Rotten lips can be caused by eating mangoes, usually as a result of a lip metamorphosis that occurs after exposure to mangoes, but it can also be due to other causes. Specifically as follows. 1. Mango contains monohydroxybenzene or dihydroxybenzene and other chemicals, which are allergens that often cause allergies, and when people contact or eat mango, they will have a metamorphic reaction at the site of contact. 2. In the lips are mostly typical acute lipitis changes, characteristic skin lesions manifested as erythema, papules, papules, small blisters on the upper and lower lips and around the mouth, there may be oozing and crusting, the patient may be self-conscious itching or pain. There may be other reasons for rotting lips, if the lip symptoms are serious, or continue without relief, it is recommended to go to the hospital in time, with the help of the doctor for targeted treatment.