Itchy throat and tongue problem.

[Aaron0794]

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What is causing this be? White coating gone in the centre of tongue.
Aaron0794 Oct 01
So from last year I have this ongoing allergies. Which turn out to be dry cough and asthma. I was on counter medication with inhalers.
I completely got over the wheezing and dry cough with medicines. But I still have the throat irritation sometimes.

And about four months back, centre of my tongue colour I noticed slight pain and there is a colour change. The white coating in the centre part looks like disappeared to a flat pink region. Doc diagnosed it with vitamin deficiency. And I took tablets for three weeks.
Pain is gone. But the coating is not fully over it. I still have that region in light pinkish colour. Been there for four months.
And body also itches sometimes. No visible rashes. But I feel it to be very itchy sometimes. What could this be?