Was prescribed cephalexin (Kaiser) for a broken skin infection on...

Was prescribed cephalexin (Kaiser) for a broken skin infection on my leg from a sporting accident. It was pussing and not healing well. Started taking cephalexin immediately after leaving the pharmacy. Within a couple days, my skin infection was not any better. Hives and bright red dots appeared on my chest, my arms, and my legs. Itching was intense - I couldn't sleep - would wake up in the middle of the night totally on fire - but I was told to stay on course by the nurse at the pharmacy and finish the bottle as I wouldn't want an antibiotic from losing its hold on the stronger existing bacteria. The hives, in the form of red patches, bumps, and streaks were visually traveling through my body and hives would break out. I resisted itching. Then one morning I woke up and my entire chest had a huge patch of hives taking up the entire space between both nipples and from the top of the rib cage to the collar bone. It was ridiculous. One week in, I called my doctor and went in for a check up. Instead of prescribing another class of antibiotics, my second doctor (and opinion) opted to stop taking the medicine all together. He determined the hives were an allergy to Cephalexin.