Signs to Watch For
Cold sores often give warning signs before showing up:
- Tingling, itching, or burning sensations
- Redness or swelling near the lips
- Then within 24–48 hours:
- Blisters appear, often in clusters
- They fill with fluid, burst, and form a crust
- Healing usually takes 2–4 weeks
- Starting treatment early can reduce symptoms and spread.
