Inside bottom lip sore
A sore on the inner lower lip is often caused by minor trauma or an aphthous ulcer, but persistent or unusual sores need examination.
The short answer
A sore on the inner lower lip is often caused by a bite, sharp tooth, hot food, friction, or an aphthous ulcer. Most improve with gentle care, but a sore that persists, enlarges, hardens, or repeatedly returns needs examination.
How can you care for a sore inside the lower lip?
Rinse gently with water, choose soft foods, avoid spicy or acidic items, and check for a sharp tooth or broken filling. Do not pull, scrape, or burn the lesion.
When should a lower-lip sore be examined?
Seek care if it lasts beyond two weeks, bleeds without injury, becomes firm, or is accompanied by neck swelling, fever, or trouble swallowing.
What should you ask about a lower-lip lesion?
Ask what type of lesion is present, whether a tooth or appliance is rubbing it, and whether examination or a sample is needed.
Frequently asked questions
What is the main cause?
Aphthous ulcers are shallow painful lesions on movable mucosa, while trauma produces a sore beside an irritant.
What should happen next?
Ask what type of lesion is present, whether a tooth or appliance is rubbing it, and whether examination or a sample is needed.
Keep reading
Who wrote this page
This library is published by Dental Nation, a licensed dental group practising in the United Arab Emirates. Pages are written and overseen by the same clinical team that treats patients in our clinics, and are held to a fixed editorial standard for safety and accuracy.
This page is patient education, not medical advice, and cannot replace an examination. Anything urgent — facial swelling, trauma, uncontrolled bleeding or severe pain — needs a dentist or emergency care now.