Blisters inside the mouth in children are most commonly due to viral infections or mouth ulcers. Ensure he drinks plenty of fluids and avoid spicy, salty or acidic foods. If there is high fever, rash on the hands/feet, difficulty swallowing, poor oral intake, or the ulcers persist beyond 7–10 days, he should be examined by a pediatrician.
Answered2026-07-06 11:49:01
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