puss and blood filled blisters on outside of vagina

It sounds sore. It also sounds like a simple bacterial infection like you'd yet in your throat. These infections thrive on mucus areas and are quite common in the vaginal area. To be sure I'd check with your doctor. Even if it is just bacterial it won't go away without antibiotics. Quarentee doc has seen this problem loads of times. 8)

Sounds like a Cyst

My brother used to have one on his lip and my mum used to get them inside her ovaries

My sister currently has a few of them and they cause irregularities in your period cycle

Get a doctor to take a look at it, even though it might be embarrasing to show your bits to some random person :-P

Hope I helped