I Am 7 Days Post Aclr And Have A Rash

I am 7 days post aclr and have a rash emanating from knee up to my thigh and down to my ankles. The rash looks like red dots surrounded by a white halo...possibly similar to the red bumps of hives. It is hot to the touch and itches terribly. I am not on any pain medication...the knee itself feels pretty good - just working through some stiffness. We are thinking more along the lines of an allergic reaction rather than an infection...is it possible to be allergic to the allograph?