14 years old- I have a very strange looking red mark on my foreskin *hidden unless foreskin is pulled back*. I have had a few sexual experiences and they were not protected and I am worried that it might be an STI or something worse. I have take a photo of it but I don’t know how to show it on here. The mysterious red mark is about 2-3cm long and has dark dark red tiny dots around it. (Inside the red).