Anus skin burnt after laser hair removal.

I went to do laser hair removal treatment for my butt and anus area, everything was great and suddenly I felt this crazy burning sensasion after a shot of laser around my anus, I always go for this treatment, but this time was so intense, I went home, and next day I had this crazy burning like pain around my anus, I looked at it and it was hardened skin with a weird burning and pain sensation, and after 4 days I still have it, what should I do ?