I am wondering what my condition is.  I am not sure if I have herpes or STD's because I have only been having sex with my girlfriend.  I got a pimple around my pubic area about a week ago and after a few days it turned into a blister and it kept growing in size for a few days.  It is now the same size as it was about 5 days ago but 2 more pimples have shown up near the affected area and they are now starting to blister also.  These ones are a lot smaller.  This is around the pubic area and the waistline.  I am also a surfer and when I still had the pimple I fell on the sand after surfing where my shorts almost fell off and I got a sand burn around my pubic area.  When I first saw the blister I thought it was because I fell on the sand and scraped the skin but now 2 other pimples have formed around the area and blistered I am getting worried about what this is.  I thought the blister would at least start to scab up in the past week but it has been about the same as a week ago, maybe a bit better.