What is the fastest way to get rid of a cold sore?
Last updated September 3, 2026.
The fastest proven way is a prescription antiviral - valacyclovir or acyclovir - started at the first tingle, before the blister forms. Early treatment is everything with cold sores; once the blister is established, antivirals do much less. Over the counter, docosanol cream shortens healing modestly, petroleum jelly protects the sore, and cold compresses take the edge off pain. Untreated, a cold sore runs its arc - tingle, blister, weep, crust - and heals in about 10 days. It is contagious from first tingle to fully healed: no kissing, no shared lip balm or towels, and hands washed after any touch. Frequent outbreaks deserve a conversation about daily suppressive therapy. Pymander is a free AI doctor, 24/7 by text, and can help you decide what to ask for.
What to do
- Act at the tingle: antivirals started in the prodrome beat antivirals started on the blister.
- Ask about keeping a course on hand: people with recurrent cold sores often keep valacyclovir ready.
- Use docosanol and petroleum jelly meanwhile: symptom relief and skin protection, not a cure.
- Treat it as contagious until healed: no kissing, shared towels, or lip products from tingle to gone.
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