The last thing you need on the day of your hot date with the mystery man from the coffee shop is an unsightly cold sore popping up to greet you in the morning. Cold sores are painful red blisters that show up around your mouth. They are a virus called herpes simplex type 1 and there is no cure for them, they will always return. The virus is usually acquired in childhood through contact with infected saliva. The virus lays dormant and pops up in times of stress, or extreme weather conditions or too much exposure to the sun. There are things that you can do to help however, in time for your hot date.