Looks like a normal mouth ulcer. Will most likely disappear within 7 to 10days. Try and rinse with some salt water and treat the pain symptoms only with over the counter pain killers.
It looks like a common canker sore inside your lip. Try using an over-the-counter oral gel or saltwater rinses to ease the pain. Avoid spicy or acidic foods until it heals.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.