serious rug burn, what to do?

I fell face first onto my carpet saturday night and woke up sunday morning with a terrible rug burn surrounding my eye. the effected area is about the size of a fist, and covers the upper part of my cheek, eyebrow, and a little on my eyelid. it's pretty sore, but I can't tell if that's from the burn or from the inevitable bruising that I have from slamming my face into the floor. Today (monday) the are is yellowish-green-brown, and the surrounding area is mostly red. It burns a little, but not a lot; generally it doesn't hurt of i'm not touching it or moving my face in such a way that the scab stretches. I've read that rug burns can easily become infected, and in my ignorance, I iced the burn for a few hours on sunday morning (which i now know increases tissue damage). I'm an impoverished college student with no health insurance and not a lot of disposable income for expensive antibiotic creams. I need some advice on how to cost-effectively keep this wound clean and healthy. Thank you.