Hi, I woke up yesterday with a pea-sized puss-filled blister on my arm surrounded by a thin red ring. I talked to a dermatologist friend, who asked if I had been in the forest in Oregon/Washington lately, which I had. She suggested it could be Lyme Disease and the safest thing to do would be to get antibiotics. In accordance with her suggestion, I started taking Doxycycline Hyclate. The blister is now about the size of a dime, and completely filled with pus. It has not popped yet. This seems unlikely to be Lyme Disease to me, because there are no giant blisters in any of the pictures. What do you think this is? Could it be a spider bite? Should I pop the blister?