Penis tip skin started getting loose in last couple of months. When it is erect,it's difficult to push foreskin back and also when i try to pull it back. Few months back (approx 3 to 4 months)Its started with small crack on penis skin whenever I get erected but it was getting fine after couple of days. At present finding difficult to move foreskin forward n backward. Is that a serious problem? If needed will share the photo.