Children eating pineapple mouth pain, may be caused by allergies to certain substances in the pineapple, may also be caused by the baby has a corns of the mouth, and may be caused by the baby’s lips have a small trauma caused by different reasons, different treatment methods, as follows. 1. Allergic Lipitis: If a child is allergic to certain substances in pineapple, he or she will experience mouth pain when eating pineapple and avoid eating pineapple. 2. Keratitis: If the child suffers from keratitis, it may also lead to symptoms of mouth pain when eating pineapple, the treatment should be directed at keratitis, parents need to pay attention to help the child to clean the skin of the lips of food debris and oil, and pay attention to the supplementation of the B vitamins, if accompanied by bacterial infections, should also be used to erythromycin ointment and other medications to be used in the treatment. 3. Skin wounds: If the child has a small wound on the skin around the lips, it can also cause the child’s mouth to hurt when he eats pineapple, in this case, he should not eat pineapple for the time being, pay attention to the cleanliness of the wound on the treatment, and if an infection occurs, he can use mupirocin ointment and other medicines to be applied to the outside of the mouth for treatment, and pay attention to not put the ointment into the child’s mouth. In addition to the above factors, other reasons may also cause children to eat pineapple mouth pain, it is recommended to seek medical attention as soon as possible to avoid delay in the condition.