Cold sore that is tingeling yesterday and has gone yellow and blistery today.

Dear Ask The Doctor: I have a cold sore. it started tingeling yesterday and has gone yellow and blistery today. last night i gave my bf a head job is he going to get genital herpes now?

Dear Tully:

HSV-1 is the usual cause of cold sores on the lips (herpes labialis (see Mouth Sores)) and sores on the cornea of the eye. HSV-2 is the usual cause of genital herpes. This distinction is not absolute: genital infections are sometimes caused by HSV-1. Infection also can occur in other parts of the body such as the brain (a serious illness) or gastrointestinal tract. Widespread infection may occur in newborns or in people with a weakened immune system.