Cold sore - Symptoms and causes - Mayo Clinic
https://www.mayoclinic.org/diseases-conditions/cold-sore/symptoms-causes/syc-20371017
WebJan 5, 2024 · They're usually caused by herpes simplex virus type 1 (HSV-1), and less commonly herpes simplex virus type 2 (HSV-2). Both of these viruses can affect the mouth or genitals and can be spread by oral sex. The virus can spread even if you don't see the sores. There's no cure for cold sores, but treatment can help manage outbreaks.
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