You can use topical ointments like numbing ointments, such as benzocaine (Oragel), anti-inflammatory (steroid)
gels,benadryl allergy
liquid mouthwash, oral preparations of steroids and vitamin supplements.
It is very difficult to precisely confirm a diagnosis without examination and investigations and the answer is based on the medical information provided. For exact diagnosis, you are requested to consult your dermatologist. I sincerely hope that helps.