This afternoon I gave a friend who is HIV positive a kiss on the cheek, well not exactly a kiss on the cheek, more like the touching of two cheeks to greet someone. We were both sweaty and I had shaved in the morning, but my skin was sensitive and after I kissed him, I washed and dried my face I could see some small traces of blood on the hand towel. Well i know this doesn't sound very serious but I'm paranoid. Is there any chance of getting HIV through this?