Does genital herpes blisters always break open?

No: may also dry out

Blister: Not all the time. It may be reabsorbed by the body. the fluid in the blister can be infective. Always cover the blisters.

Yes: Genital herpes usually causes blisters on the vulva (around the vaginal opening).They will break open & form ulcers.Usually the infection goes to the uterine cervix(neck of the womb)causing cervicitis. Sometimes infection goes to the urethra(urine channel) causing urethitis with painful urination.