I have irritation on my vagina. i had been healing from sex with my boyfriend (we used a condom water based lube). i was sore for a few days, but then i developed a few pimple like things on the skin, today its worse and is blistering?

I recommend being examined by your gynecologist. Possibilities include a herpes outbreak or an allergic reaction to the condom. Either condition can be treated. Another possibility is a friction burn which occurs right after the intercourse. White Vaseline can be applied for this, but the gynecologist will recommend the best treatment after examining your vagina.