A smooth spot on the tongue can have several causes, but it may be linked to a general condition called glossitis, in which the tongue can swell and change colors. With glossitis, the tiny projections called papillae normally found on the tongue are lost and the surface becomes smooth in patches or over the entire tongue. The condition can be triggered by different conditions, including tooth irritation, an allergic reaction, infection, illness, or a vitamin or mineral deficiency in the diet.
A smooth spot on the tongue can have several causes, but it may be
linked to a general condition called glossitis, in which the tongue
can swell and change colors. With glossitis, the tiny projections
called papillae normally found on the tongue are... More