As you haven't explained clearly of what is extact problem, as there's irritation from spicy foods I think its mouth uclers or redness in mouth, just take homoeopathic medicine borax 200 4pills 4 times 4 days. It ll give relief n give him lots of water n lime juice 3 times in a week n try giving him few cumin seeds to chew for 15 mins. It ll reduce the ulcers or redness.
The symptoms are not very specific to come to a diagnosis.
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