Is cold sores contagious?
Last updated September 6, 2026.
Yes, cold sores are contagious, and they spread most easily from the first tingle until the sore has fully scabbed and healed. Cold sores come from herpes simplex virus, usually HSV-1, which passes through direct contact with the sore, saliva, or the skin around the mouth. Kissing, sharing drinks, utensils, lip balm, towels, or razors, and oral sex can all pass it along, and the virus sometimes sheds when your lips look normal. Once you have the virus it stays in your body and can reactivate later, so the goal is limiting contact during an outbreak rather than curing it. Wash your hands after touching your lips, skip lip contact with others until healing is done, and never touch your eyes after touching a sore. Antiviral creams or pills started at the first tingle can shorten an outbreak, and a clinician can prescribe them.
What to do
- Treat the tingle as day one: The burning or itching before a blister appears means the virus is already active and spreading.
- Pause lip contact: No kissing and no oral sex until the sore has scabbed over and the skin has healed.
- Keep your items yours: Do not share cups, straws, utensils, lip balm, towels, or razors during an outbreak.
- Protect your eyes: Wash your hands after touching the sore and never rub your eyes, since the virus can infect the cornea.
- Shield high-risk contacts: Stay away from newborns, people with eczema, and people with weakened immune systems while a sore is active.
- Ask about antivirals: Prescription antiviral cream or pills work best started at the first sign, and frequent outbreaks may call for daily suppressive treatment.
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