No not a problem at all. Just aply some glycerine thrice a day or rub garlic n leave for overnite n you will be all perfect. And mind you blister has nothing to do with your visa clearence.
Good bye take care and be happy.
9 years experience
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Mix a little honey in one tablespoon of coconut milk. Massage the affected area with it. Do this three or four times a day.
Alternatively, you can simply rinse your mouth with fresh coconut milk or massage coconut oil on the affected area.
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