Like everyone else, the tail is the most desirable draw point. FYI, your cham is going to hate the Sh!t out of your vet for this, (on to my point) his or her tail is most likely going to turn a very dark color even black, and could stay this way for a little while.
I've had this happen without notice and I just about clocked the vet when I returned to pick up my baby. He assured me that the color would come back (even though the tail looked dead) and it did after a few days.
Good luck and I hope the counts are good!