Hello, It is likely that you are having inflammatory bowel condition with secondary vitamin deficiency causing mouth blisters. Thorough clinical work up with radiology evaluation to diagnose and treat precisely is mandatory. Primary care points with better chances of help are as follows - maintain hydration with plenty of liquids - a bland, vegan diet - avoid all spices, non-veg, junk foods - avoid stress, anxiety - homemade fresh yogurt with probiotics to get bacterial flora replacement for diarrhea control. Make a priority base appointment with gastroenterologist specialist for further workup and manage in accordance with that. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Bhagyesh V. Patel, General Surgeon