Genital herpes is a STD caused by a virus.
The first sigh of genital herpes is pain or itching of the skin around the genital area or the anus. This begins 2-20 days after exposure to the virus.
Tender red bumps on the skin change into water blisters or open sores (ulcers). These normally appear on the genitals or around the anus. But these can also be present where you cannot see them: on the cervix (girls) or in the urethra (guys). Sometimes there is discharge from the penis, vagina or anus.
These blister rupture, becoming ulcers that ooze or bleed. After a few days these heal. The skin returns to normal.
During the first outbreak you may experiende flu-like symptoms, like a headache, fever and swollen lymph nodes in the groin.
Drugs can help to reduce the symptoms, but there is no cure. It can return anytime.

The difference between genital herpes and a cold sore on the lips.
Transmission and treatment.

“I have kissed a guy with a little wound on his lip. Now I have one too. How come?”