Re: WWYD-possible cat bite?
We treat cat scratches and bites ("good" ones when it's really broken the skin, not just surface stuff) with peroxide and then polysporin and a bandaid. Never had any troubles with infection doing that.
I'd try that and see how it looks through the day. If there's no improvement, or especially if it's looking worse, get it checked out. Heck, I'm sure the Dr has seen sillier stuff!