I wouldn't worry about STDs from this at all. I can't imagine it was blood, and you can get checked if you want, but I don't see a cause to.
If it was blood, it would have saturated it all, not just a couple of layers on the top, and then nothing till the middle. Does that make sense?
Aj
Well, what you say does actually make sense. However, when you are in the actual situation, and you are uncertain where the red stuff came from, you get a bit concerned.
Oh absolutely, and I can't say that if I saw the same thing that I wouldn't freak first, and ask questions later. :)
Aj
I have the same problem but I don't know what it is
I've been itching. And after going pee and whipping myself and had a lot of bright blood I whipped again and it was gone