What is this patch on my tongue?

I noticed i patch on my tongue. It looks like all the taste buds in that area has been removed or something. It is rather smooth. I have had patches on other parths of my tongue, but not as big as this one. It doesnt occur often, but I am kind of concerned. Haven't burnt my tongue and it doesnt hurt.or... show more I noticed i patch on my tongue. It looks like all the taste buds in that area has been removed or something. It is rather smooth. I have had patches on other parths of my tongue, but not as big as this one. It doesnt occur often, but I am kind of concerned. Haven't burnt my tongue and it doesnt hurt.or anything. I've had the flu this past week. Could that be the cause? If it is, what was the reason for having the patches all the other times?
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