Fever blisters and oral sex Sep 23, 2024 · Oral herpes, usually caused by the herpes simplex virus type 1 (HSV-1), shows up as cold sores or fever blisters on the mouth. These are referred to as cold sores or fever blisters. An HSV 1 infection is permanent, and someone infected with the virus will live with it for the rest of their life. Oral herpes tends to last for about two to three weeks. Apr 16, 2025 · However, HSV-1 can cause genital herpes through oral sex, and in rare cases, HSV-2 can cause oral infections. The blisters burst and leave ulcers/sores. It can be spread through skin contact or fluids from the mouth or genitals. People sometimes confuse cold sores with canker sores. […] May 31, 2024 · A cold sore is a blister or cluster of blisters on the lip or surrounding the mouth. Children and Cold sores are caused by the herpes simplex virus. kvgcfzckxxviqjpcecifcdwvbyxvkuapbhjowxhuloqrygjezyrsmglkxlqansaqgvyizuclxzqohewqubt