Canker sore on upper lip
A canker sore on the inner upper lip is usually a shallow, tender ulcer that heals with protection from irritation and targeted care.
The short answer
A canker sore, or aphthous ulcer, affects non-keratinized mucosa such as the inner lip. It differs from a cold sore on the outer lip, which often begins as grouped blisters.
What is the direct answer?
What does this question mean?
Avoid biting the area, choose mild soft foods, and use a soft toothbrush. Ask a pharmacist or dentist about a protective paste or pain-relieving treatment.
What can you do next?
Have it examined if it persists, repeatedly returns, is unusually large, or comes with fever, weight loss, eye symptoms, or ulcers elsewhere.
When should you seek dental care?
Ask whether it is an aphthous ulcer, trauma, or another condition, and what pattern would justify testing or referral.
Frequently asked questions
What is the main point to remember?
A canker sore, or aphthous ulcer, affects non-keratinized mucosa such as the inner lip. It differs from a cold sore on the outer lip, which often begins as grouped blisters.
When should I arrange an examination?
Ask whether it is an aphthous ulcer, trauma, or another condition, and what pattern would justify testing or referral.