Talk to General Physician on Pimple Type Blister In Lower Lip

My lower lip interacted in between teeth then a blister appear after few days. Almost 2 week has gone it becomes big while i eat and never burst but in morning reduces it size and become a pimple. But not settle. No severe pain feeling but irritating and discomfort plz treatment required. I applied clinica gel then daktarin cream but pimple is not going off