<s>[INST] I have Lichen Planus of the gums, about a week ago I also had a blister on the inside of my lower front teeth and the gums were sore,  I irritated them more by brushing, the pain is subsiding but yesterday I felt a painless lump just below the area, could you tell me what it is [/INST] Thanks for your query, I have gone through your query. The blister could be because of lichen plans calledbullous lichen plans or herpes virus infection. The lump be a periapical abscess secondary to tooth infection or gum infection. Consult your oral physician and get it ruled out. If it is because of lichen plans the can use topical steroids. If it is tooth infection take a course of antibiotics and get the tooth treated. I hope my answer will help you. Take care. </s>