I Shaved The Other Day With A Razor Blade That

I shaved the other day with a razor blade that had a little bit of rust on it but i did not think it would affect anything but the next day i experienced lots of itching and redness and i have had it ever since. I guess i do have a little more discharge than usual but its not enough to make me worry. It's been almost a week now and its hard to help it heal because i can't stop itching at it and i don't have anything to help stop it. What should i do?