What to do if i cannot pull my foreskin back?

See doc...: Do you mean not able to pull the foreskin up or down? Up? It hints you have phimosis - tight long foreskin covering penile head; if so and bothering you, do circumcision. If difficult to pull down with swelling, you get paraphimosis for which you need to go to er for urgent attention to reduce swelling and pull it down by experienced professional hands; if impossible, do dorsal slit under local..