On vacation in the wilderness I started developing puss filled blisters (2mm) on my lower right leg. I did a lot of hiking and rowing and every time I would get a cut, a puss filled blister or normal blister will follow. Sometimes the blisters will pop up on it's own (only on my lower right leg). On the 8th of Jan 2016 I woke up with a little pimple on my right lower leg. I popped the pimple and the skin turned normal (no yellow point). 5 Days later it was extremely painful (could hardly walk) and swollen, redness. The skin (10cm by 10cm circle) was rock hard. The doctor gave me 2000mg antibiotics per day for 5 days, 2 days later I went back and the doctor cut my leg open (no sedation, 1cm cut to drain the wound). She said it looked like a spider bite, the "spider bite" is better now (5cm by 5cm skin still hard, but not painful). These puss filled blisters are popping up all over my right leg, I have about 20 now. First it was on my ankle, then behind my knee and now it's on my upper leg. When should I be concerned?