So today I went over to my friends house and while he was on his phone I told him that I was going to use the bathroom. I got up and went to his mothers room. In there I got one of her panties from a drawer and used it to masturbate. I did cum at the end but didnt come inside the panty. My actual concern is that while masturbating I think the fabric of the panty made my penis bleed a little and now I have a little red spot on my penis which burns. So is it possible for me to get an STD from clean panties because my skin got hurt?