I'm 17 and I've been having some problems with my penis, on Sunday morning my penis began to 'fill up' as if to become erect, but it was still it's flaccid size, it just ballooned up.

This only lasted a few seconds and went away but it did it a few times, and started lasting longer. There where also a couple of small purple patches that appeared that looked like bruises, I ended up going to A&E to have it checked because it was very uncomfterble. I had it checked over but the doctor couldn't seem to see what the problem was, but he wasn't too concerned and told me to just go to my doctors about it.

So today I've been to the doctors and he was unable to work out what the problem was either, but has just did a blood test and said it might just fix itself on it's own.

It's been better today, it's felt quite tender and aching a lot, and it seems like it's slightly swollen, but I'm unable to get an erection.

The only thing I can think of is that I did injur my penis a while ago, back in august last year I'd knocked it and I'd had problems where sometimes it would hurt slightly when I had an erection if I pulled my forskin too much (I'm unable to pull my forskin right back because it's too tight) but this has gradually got better.

I also remember about a week ago I woke up because I think I'd hit my penis while turning over in bed, I didn't think much of it but since then I'd had the odd 'semi' erection that was very hard while in bed which was a bit unusual for me.

Thought I'd post it here since I'm worrying about it a lot and hope someone will have an idea about what could be wrong.