Background
Hi, Welcome to Chat Doctor .com. I had gone through your question I can understand your concern. The condition as per your history is suggestive of fungal infection, because of Chat Doctor.  You need to visit a doctor (dental surgeon) to get it properly evaluated. During mean time you can apply clotrimazole 1% mouth paint three to four times a day. Hope my answer will help you and visit us back if you have any further queries. Regards