B.W.
Are you breastfeeding? Thrush will appear as patches of white, normally on the gums, tongue, and insides of the cheeks.
If its thrush, I wouldn't bother with the prescription that docs will give you, Nystatin contains sugar and that will only make the problem worse. Get Gentian Violet at the pharmacy, and go to www.kellymom.com and type 'Gentian Violet' into the search you'll find out how to use it. Its the only thing that worked for thrush for us.