Hello, Thanks for writing to us. Soreness on palate can be due to-1. denture stomatitis caused due to dentures or appliances inserted. 2.abscess developed due to spread of infection into periapical area through deep caries or periodontal infection. I would suggest you to get a thorough clinical evaluation done. Discontinue use of appliances or dentures causing allergy. Pus if present has to be drained and curetted. Take care.