Ive been to the dentist and he said I have benign mucous membrane pemphigoid. The inside of my front lip keeps getting sore.  I have found that I do keep irritating it (unintentionally). I have been using a prescription oral salve for  at least four months.  If I quit using this the soreness returns.  2 weeks ago it started while I was still using the salve.  I have rosacea.  Could there be any connection to the rawness of my lip and rosacea?
Thanks for your question, the recurrent ulcers on your lip could be because of many reasons most common of which is recurrent authors ulcers, which requires symptomatic treatment with analgesics and topical steroids...if it keeps rec curing then do a biopsy in that site to rule out any other conditions...