Hi. As per your case history we need to get further details like - Is it flat or swollen? Does it pain or cause burning on eating food? Is it the first time you have this? Do you have any systemic disease like diabetes? My Probable diagnosis is either candidal infection or multivitamin deficiency. My treatment advice is - 1. Take a multivitamin supplement like supradyn twice daily. 2. Apply an topical antifungal mouth paint like clotrimazole twice daily. If problem persists then consult a dermatologist. Thanks. Dr.harshit bhachech. MBBS, DDVL.