Can I continue to eat pineapple if the corners of my mouth are sore?
Whether or not you can continue to eat pineapple when experiencing mouth corner pain depends on the specific circumstances. If the pain is related to local dryness, pineapple consumption is generally acceptable. However, if the pain is associated with angular cheilitis, pineapple should not be consumed further. Detailed explanations are as follows:

If the mouth corner pain is caused by localized dryness without infection, eating pineapple is usually safe. Pineapple is rich in vitamin C and antioxidants, which can help promote wound healing and enhance immunity. It is recommended to cut the pineapple into small pieces or choose ripe, softer pineapple to reduce irritation to the affected area.
Angular cheilitis is commonly caused by infection, trauma, or nutritional deficiencies, and is characterized by redness and pain at the corners of the mouth. As an acidic food, pineapple may irritate the affected area and worsen pain and discomfort. Therefore, patients with angular cheilitis should avoid consuming pineapple as much as possible.
During treatment, maintaining good oral hygiene, avoiding spicy foods such as chili peppers and Sichuan peppers, and following a bland diet can help accelerate recovery.