For the last bloody time, NO IT ISN'T.
The cutters and snippers have been saying for centuries that leaving a boy intact will cause hairy hands, hunchbacks, hernias, epilepsy, penile cancer and nowadays STDs. If that were the case, man would have died out long before circumcision was invented.
You mean phimosis. That is no reason to circumcise at all. In children, the foreskin is ALWAYS stuck to the gland. It only starts coming loose as they become old enough to masturbate, and in some cases it's a little slower than others. Also, as boys become men, usually the foreskin grows a little earlier than what's in it, but sometimes the reverse is true. This solves itself by the time you are sixteen and everything is proportionate again.
However, too many older American doctors have never received any training in how a foreskin works, so their "solution" to every "problem" is to "have it done". That's like having every broken limb "done" by amputating it.
In the rare cases where the foreskin stays too small after you have fully grown, it can simply be made larger, duh. That's a very simple type of minor surgery, much less intrusive than a full-blown circumcision, and much cheaper. Which is, of course, why American docs will "advise" to "just" cut off half of your pride and joy.