White ring on foreskin

Hi. I'm a 15-year-old boy. About 4 months ago my foreskin well and I had some red patches on my glans. I think it was balanoposthitis. However, it recurred after two weeks. Then I started to wash my penis every day with water and it didn't recur anymore. About 2 months ago though, I got some red spots on my glans during a course of antibiotics for a infection caused by toenail. I had to have another course after about 2 weeks from this and it recurred again. I don't know how long the white ring has been present, but I've been worried about it for a week now. The tip of foreskin looks maybe a little red and when I start to pull the foreskin back, the ring is present from stretching. I'm not sure what it is, but I've read that many rings like this are hard on the surface, but mine's smooth like normal foreskin tissue. It's a little uncomfortable to keep my foreskin retracted when erect, but nothing serious. It retracts just fine while flaccid. I'm really worried that the ring would be scar tissue from the previous infections (or retracting while the foreskin was tight during them), but I'm not sure what scar tissue would be supposed to look like. I've also read that a "secondary" phimotic ring would only tighten, but I don't know if that's true. I'm not sure if it's a phimotic ring either, because it doesn't prevent me from retracting the foreskin. This condition is not causing me any problems right now , the red spots haven't recurred either - I'm just really worried about scar tissue and the ring. The internet seems to be full of different opinions on this subject and I don't want to lose my foreskin. What could this be? I'm really concerned.

Oh and I also want to mention that I was started given testosterone shots for delayed puberty 4 months ago - my penis has seem to be grown a little since then, at least the foreskin covers less of the penis. I wonder if the tightness and white ring could be a result of the penis growing faster than foreskin.