Chordee is a condition where the frenulum on the bottom of the penis is too tight. It would also have pain and perhaps tearing. That doesn't sound like this.
It's on the top? Sounds like an adhesion. They occur naturally with skin rarely, but on occasion. Chances are, if you gradually pull your foreskin back while erect, it will come apart on its own. Otherwise, there's a trivial surgery that can cut it off. But it's harmless.
"I don't believe in magic. But I do believe in interpreting coincidence exactly the way you want to." -Sherman Alexie