Conditions · FAQ
How can I tell whether a lip sore is a cold sore?
Short answer
Cold sores often start with tingling, itching, or burning, followed by a group of small blisters near the lip edge. The blisters may break open and form a crust. Canker sores usually occur inside the mouth and are not caused by herpes. A physician can assess symptoms that are unclear.
A cold sore often begins with tingling, itching, tenderness, or burning in one spot. Small fluid-filled blisters may follow. They can cluster together, break open, and form a crust. Repeat outbreaks often appear in the same general area, though appearance alone cannot confirm the cause.
Not every lip or mouth sore is a cold sore. Canker sores are usually shallow sores inside the mouth and are not caused by herpes. Cracked lip corners, skin irritation, pimples, and some bacterial infections can also look similar. A first herpes outbreak may include fever, swollen glands, or painful sores inside the mouth.
For an online review, share clear photos and describe when symptoms began, whether the area tingled first, and whether this has happened before. A licensed physician in your state decides whether online care is appropriate. An in-person exam or a swab of a fresh sore may be needed if the diagnosis is unclear. Seek prompt care for eye symptoms, widespread sores, or trouble drinking.
Sources
Written by the Verra clinical team · Medical review pending
General information, not medical advice. If you're in crisis, call or text 988.