Hi there. Thank you for your question. I will be helping you out with your queries. Please attach a picture here so that I would be able to provide you a better opinion.
It does sound like a fungal or yeast infection from what you are telling me.
A fungal culture and sensitivity testing may help in telling us which anti-fungal medication will kill this fungus because at times yeast can be resistant to the usual antifungal medications that we use which is why fungal culture and sensitivity should be done to determine exactly which medication will cure the bug.
Another possibility is that of leukoplakia. Leukoplakia is a white or gray patch that develops on the tongue, the inside of the cheek, or on the floor of the mouth. It is the mouth's reaction to chronic irritation of the mucous membranes of the mouth. A tongue biopsy may be required to diagnose oral leukoplakia.
So it may not be a fungal infection after all.
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This does not look like thrush to me. I personally think that this seems like leukoplakia.
I would not use anything on the tongue.
I would just allow it to heal up itself over the next two to four weeks to see how it goes.
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