Suggest Treatment For Difficulty In Moving Foreskin And Dryness

Hi
Sometimes when my boyfriend becomes erect i cannot move his foreskin past the head of his penis without hurting him. Especially the next day after sex. Also he tip of his foreskin dry. To be honest it is starting to affect our sex, i am afraid of hurting him. He does not want to go to the doctor for advice so I thought id ask here and maybe your answer will spur him on to get checked.