I wish my father had done his duty on this one, but he didn't. I had a case of "Phimosis", which means the skin was too tight to retract without serious stretching. I did not know this until I was fifteen, and it is a wonder I did not get an infection.
At that age, I was "molested" by a Baptist Preacher who at least did me the favor of telling me while he was playing with my cock, that I needed to push the skin back, so after that I went to work on getting it done. It took quite a while, and a bit of pain, before I was able to get it back easily.