Outer lip ulcer
An outer-lip ulcer may follow trauma, irritation, or a cold sore, but a persistent, recurrent, firm, or unusual lesion needs clinical assessment.
The short answer
The outer lip is skin and vermilion; a crusting blister, a cut, a contact reaction, and a persistent keratinised sore have different appearances and causes.
How should you care for an outer lip ulcer at home?
Keep it clean, avoid picking or biting, and use plain petroleum jelly for cracking; note its size and changes.
When can an outer lip ulcer need prompt review?
Arrange review for persistence, easy bleeding, firmness, recurrence, or a neck lump; rapidly spreading swelling or airway symptoms are urgent.
When does an outer lip ulcer need dental assessment?
Ask whether it appears traumatic, viral, inflammatory, or in need of a swab, prescription, or biopsy.
What should you ask about the cause of the lip sore?
first-look
Frequently asked questions
What kinds of sores can appear on the outer lip?
The outer lip is skin and vermilion; a crusting blister, a cut, a contact reaction, and a persistent keratinised sore have different appearances and causes.
What should happen next?
first-look
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.