If there is a bulge in something, there is a sudden large increase in it. ...a bulge in aircraft sales. ...the huge bulge of payments due over the next two years. Synonyms: increase, rise, boost, surge More Synonyms of bulge.
Two types of herpes simplex virus infections can cause genital herpes: 1  HSV-1. 2  This is the type that usually causes cold sores or fever blisters around your mouth, though it can be spread to your genital area during oral sex. 3  Recurrences are much less frequent than they are with HSV-2 infection.
How HSV-1 Causes Cold Sores. After you've been infected with HSV-1, the virus usually goes dormant in your body for a long time. At some point, the virus reactivates and uses your nerve pathways to travel to a certain area of skin, usually around the lips but also commonly elsewhere on the face or inside the mouth.