Hello. For the past month or so I have noticed that during masturbation, the area around my frenulum and below the head, around the neck of my penis, bleed and burn. The pain isn’t excruciating, but it is enough to make me stop, and to be concerned. I waited a little more than a week (probably 8 or so days) between masturabtion and it felt fine, but when I go to masturbate the burning and bleeding come back. Also, there was a lot of dried/dead skin around the frenulum and neck that I have peeled off. There seems to be a line around my neck, kind of like a fission, but it isn’t because it wouldn’t make my frenulum bleed and burn like it does. All of this started a couple days after sex. Do you think I could have an STD?