I have a scab on my lip that won’t go away. I can’t get an appointment right now. What is it?
A scab on your lip that won’t go away can be frustrating—and there are a few common causes, most of which aren’t serious, but some do need attention if they persist.
Here are the most likely possibilities:
1. Cold sore (very common)
Often caused by the herpes simplex virus (HSV-1), a cold sore can start as tingling or burning, then form a blister that crusts into a scab.
Signs to look for:
Starts as a small blister → then scabs over
May tingle, itch, or burn
Tends to come back in the same spot
These usually heal within 7–14 days, but if yours keeps coming back or never fully heals, it could be recurring.
2. Cracked or irritated skin
Dry lips, lip biting, or picking at a wound can cause a scab that keeps reopening.
Clues:
You notice yourself picking or licking your lips
It heals a bit, then breaks again
No blister stage
3. Angular cheilitis (if it’s at the corner)
If the scab is at the corner of your mouth, it could be a yeast or bacterial issue.
Signs:
Cracks at the corners
Redness, soreness
May sting when opening your mouth
4. Impetigo (bacterial infection)
More common in kids, but can happen to anyone.
Signs:
Honey-colored crust
Spreads or grows
May be slightly swollen
5. Something that needs checking (if it won’t heal)
If a lip lesion doesn’t heal after 2–3 weeks, you should take it seriously. Rarely, persistent sores can be linked to conditions like actinic damage or even early skin cancers.
Red flags:
Lasts more than 2–3 weeks
Keeps bleeding or growing
Becomes hard, raised, or very painful
You didn’t have a blister before it formed
What you can do right now
While you’re waiting for an appointment:
Don’t pick it (this is the #1 reason it won’t heal)
Keep it moisturized (petroleum jelly works well)
Avoid spicy/acidic foods that irritate it
Use lip balm with SPF if you’re in the sun
If it seems like a cold sore, you can try over-the-counter antiviral creams
When to seek care urgently
Try to get medical help sooner if:
It’s getting worse instead of better
There’s spreading redness or pus
You have fever or swelling
It hasn’t healed after ~2–3 weeks
If you want, you can describe what it looks like (color, size, how long it’s been there, whether it started as a blister), and I can help narrow it down more specifically.