What should I do about a possible infection w/ out going to doctor?

I popped my blister about two days ago. I got it from ice skates and it was about the size of my thumbnail. I popped it was a pair of nail clippers and now its red (not blood) around it and hurts when I walk. First of all: Is it an infection? and second, if it is, how do I get rid of it without going to the doctor? Thank you!