Plz tell me how do you know when you have herpes?

Ulcers!: Genital herpes is a viral infection that most commonly presents w/ painful sores or ulcers in the genital area. Outbreak can start as pain & itching. There may be small red bumps or tiny white blisters. Some pts have pain w/ urinating, recurrent vaginal irritation, painful lymph nodes in groin, pain down leg. Inital outbreak may feel like flu. Sometimes no symptoms . Culture of lesion diagnostic.