I am 54 years old, 5 6 and weigh 130 lbs. I ve recently noticed an indention to my right buttock that didn t use to be there. When I saw my GYN doctor, he said to be on the safe side, he wanted me to have a CT scan. There is no pain,bruising, discoloration or recent injuries. However, I have a slight increase in my usual low back pain. What could be the cause and should I get a CT? Could he be thinking, bone loss or cancer?