Sometimes....: The front surface of the tongue has many small taste buds that give it the berber carpet/cobble-stone look. There are a bunch of larger taste nodes (circumvallate papilla) in a v shape on the back of the tongue too. Sometimes a taste bud dies-it swells up, hurts and looks like a skin tag before it eventually falls off. You constantly make more taste buds, so no worries.
Answered 5/8/2018
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