I noticed around a month ago due to stress I believe that I started to get canker sores on the inside of my lips, under my tongue, and on gums. I have used medicines and used a specific one called Kanka and think it got on my lips and numbed them one night. When I woke up the next morning I noticed my lips had a reddish ring around the inside of them and still occurs from time to time and not sure if it was the medicine or what but its the only thing that touched my lips differently. Also my gums under my lower lip I notice are red and kind of inflammed but no bleeding which is good. What could be causing that? Brushing too hard? Toothpaste?  Mouthwash?
HelloWelcome to ChatDoctorUnder extreme physical or mental stress authors ulceration occurs in oral cavity. This occurs due to unknown reasons but low vitamin B12 levels may further predispose to development of ulcers. I would like you to try relaxation exercises and to not take undue stress. Psychosomatic component is main factor for development of authors ulceration. You can take vitamin B Complex capsules for immediate relief. Thanks