Deep sore inner right cheek. redness around white in the middle. 21 healthy female. no other oral issues. its been 3-4days. started using peroxyl antiseptic oral cleaner yesterday. whats issue also who you see? barely eating due to sensitivity?

Hundreds of different lesions fit your narrative. Any pictures you send are not visible on this site. Oral lesions self-heal in 2 weeks, so if still present 14 days from onset, see specialist Oral Surgeon or specialist Oral pathologist. Forget the Peroxide, may actually inhibit healing. Take 1 Ibuprofen every 4 hour w food or liquid for pain. If not enough, add 1 Tylenol to the Ibuprofen. EAT.