Blisters In Back Of Knee, Around Genital Area, Pop Easily Leaving Skin Open. Herpes?

I'm not sure if I have genital herpes. I started with a blister on the back of my knee with eventually grew to the size of a £2 coin. Then another one appeared right next to it. Then after a couple of days should noticed small blisters around my genital area, not about on my genitals, that pop very easily and leave open skin. It does not guarantee before the parblisters appear, but after while they're healing. Some of them are tiny, some much bigger, but never in a group together. Any ideas what it sounds like?