some one please tell me what this is?

about a moth and half ago i got this really small pimple looking sore on my leg it got read around it and hard and hot with fever within 3 days the red was clear down my leg and i couldnt walk i went to the er and they said it was either a bite or a boil and put me on antibiotics it finnaly healed but the spot is still there and hard. now today i woke up with another small pimple above where the other one was and now its hurting and hot andt he red area around it is growing bigger. i have no health ins and i cant afford to go back to the dr or er someone please tell me what this could be. also befor the last one got better it had alot of puss come out of it. very very nasty. i cant afford to be off work again due to these sores and no one here has ever seen anything like them before... please any advice or help would be great