Pineapples are rich in vitamins, enzymes, and antioxidants. Despite their sweetness, pineapples are low in calories, also fat-free, cholesterol-free and low in sodium.
At the same time, the fruit is a great meat tenderizer. However, eating too much can result in the tenderness of the mouth, including the lips, tongue, and cheeks.
This is due to the high amount of vitamin C that pineapples contain. Consuming large quantities may induce diarrhoea, nausea, vomiting, abdominal pain or heartburn.
So if the irritations don’t resolve by itself then do consult your doctor. This is because you might be having pineapple allergy.