Thanks for the answers guys. I'm quite happy to see the doctor about it (no amount of embarrasment could match the itchiness!) but for the fact that I have recently moved to the usa and don't have medical insurance for another couple of weeks! I hate being in this situation...
Actually the rash and the swelling on my penis have both got a little better over the last 24 hours. But it's the little dots under my pubic hair that are still as strong as ever. They're beginning to spread a little onto my thighs one by one and onto my stomach.
I have to say that the rash under my pubic region is nearly all joined together. Though it is clearly formed by lots of little dots. Some of them do appear to line up with the hair follicles, but I guess that could really be random. They aren't really raised, nor have any kind of pus-filled centre - just little red dots rangeing from about 2 to 5 mm. I guess it'd be unlikely that i'd get folliculitis and some kind of fungal infection which happened to spread up my penis at the same time?
The worse thing is actually not knowing for sure what the problem is. I'm pretty sure I haven't caught anything off a girl, but all the same it's worrying.
Roll on the beginning of next month when I can get it checked out by a professional if it hasn't been cured by then by some kind of miracle (and I am praying to the gods of all major religions that it will be cured - for my sanity).
Thanks again!