I Have Hives That Deleoped On My Inner And Outer

I have hives that deleoped on my inner and outer thighs and glute(all on right side). The hives developed after I worked out. Started with a burning sensation on my skin then turned into hives 24 hours later. I made an appointment with my PCP for this Friday. I have couple of herniated discs in my back and I was thinking it could be related as the herniations are on the right side as well. L4/L5/S1
I'm an relatively healthy 41 year old Caucasian male that doesn't take any medication other than an occasional Tylenol or Advil.