help with urostomy bag!!!!!

Hello my name is Wendy Johnson, my dad has just recently been diagnosed with bladder and just had the surgery to remove the bladder. He is suppose to start chemo in the 11th of this month, but we are having difficulty with the bag leaking.  His stoma was not placed where it normally would go due to his body structure so it is lower on the abdomen. Our issue is where it has been placed there is a crease interfering with the seal. Can anyone help us? Any suggestions?