Blisters  in mouth can be because of many  reasons - tension, exertion, disease, sickness, change in hormones, menstruation  period, immediate reduction in weight, allergy from particular food product and deficiency  of vitamin B 12, iron, minerals and folic acid. To prevent blisters it is necessary to eat vitamin in food.

 Foot Blister
 Sprinkle your feet with foot powder before wearing sandals to avoid any blisters. If you still feel shoe on skin rubbing, protect the sensitive area wit a bandage before the blister forms. To get rid of the blister, take a clean needle and sanitize it with alcohol. Pop the blister and use cotton to clean any fluid that comes out of it. Apply an antibiotic ointment without trying to scrape off the skin and than cover the area with a bandage.