10 Causes and Treatments for Cold Sores

Treatment: Don't Touch

Both for a person with an outbreak and for a loved one who doesn't have the virus, the first rule and "treatment" is simple: Do not touch. Wait for the outbreak to disappear.

Herpes simplex virus spreads through fluid that comes from the blisters, though it can spread even if the sore doesn't look severe [source: Mayo Clinic].

And if you have the virus, you could spread it to your eyes, which causes a whole host of other problems. So wash your hands frequently and don't touch the sore [source: McKinley].