I am suffering from a fungal infection (a white patch in middle) in tongue. it started like a white patch through out my tongue 15-16 years ago. it was very irritating, was unable to eat anything which is spicy. now this fungal infection occurs twice-thrice in a year lasts for a month. few doctors say it is leukoplakia, few say its due to vitamin deficiency. i am taking medicines such as forcan 150, combiflam, full 365 tablets and use an ointment Kenacort. kindly advice is it something serious. i started smoking 6 years back