First, don’t ever force it back. If you do, you risk paraphimosis, which is when the foreskin swells, you can’t pull it forward to cover the head, and the blood supply to the head is cut off. It is every bit the medical emergency you imagine it to be.
Gentle stretching with the fingers every day should fix your tight foreskin
in 4 to 6 weeks. If that doesn’t do it, see your doctor, and ask for a prescription of a topical steroid, such as betamethasone
cream. Combined with daily stretching, it will cure most of the stubborn cases.