Large, red, and itchy spot on the inside of my right leg, next to my knee.?

Ok, here is what happened. About 2 weeks ago my boyfriend and I were having sex and he drug his teeth across the spot where the rash is now. A little bit later that night I noticed there was a red line, about 2 inches long by 1/2 inch wide where he bit me, I wasn't too worried about it then thinking it was just red. But now the area has grown to about 2 inches in diameter into a nice red, itchy circle. The center area has a few raised bumps that are now flaking and Very, Very itchy. Before then there was no problem with my skin in that area at all. He is my 1st and only and I am his 1st and only. Can anyone help me?