My little brother is 3 years old and has had asthma since he was about 14 months...He has white areas on his tongue, they are not really spots it is just places where it looks irritated and kind of looks like the top layer has come off...I was told that this can be caused by his inhaler, is that so? If not, what could it be, and how can I get rid of it...He does not use his inhaler very often, and they are still there...