Thrush...a wonderful side affect of treatment for so many things.
To diagnose thrush, candida albicans, a swab of the offending whitish area must be taken and observed under a microscope. Thrush is an opportunistic part of the oral flora that will establish itself in the abscense of normal flora or where oral tissues are or have been compromised/injured and are going through normal healing or an antibiotic has compromised the normal microbiological flora. Once it establishes itself it will spread over other oral tissues.
Thrush is not pretty or pleasant and must be treated. An area in your mouth that appears whitish and you can wipe off, then recurs looking the same within 12 or so hours after is most likely thrush.
Talk to your docs as soon as you suspect thrush. There are simple solutions to combat this problem. Oral anti-fungals such as Diflucan (one dose) can eliminate it. Oral rinses with nystatin suspension are also effective.
My point, get it diagnosed and then get rid of it.
If anyone has questions let me know.
Cheers,
Mike