What should i do if i have a canker sore on my bottom lip?

Exam: If it's on your lip, there's a good chance it's a cold sore which requires different tx. Than a canker sore. Get an exam to see what it is and how best to treat it.

Canker sore: is the most common oral lesion. Individual ulcers typically last 1-2 weeks. The condition is idiopathic (cause is not known) recurrent aphthous ulcers is usually self-limiting. Try to keep adequate oral hygiene as possible. If concerned see your dentist after 10 days or visit today for laser immediate amelioration.