M.S.
I would bet it might be a pimple or simple little scratch that got infected. Check it latter, and if the neosporin isn't helping, a call to the consulting nurse in the morning might be in order. I'd be curious if she's running a fever? If not, it's probably nothing to worry about, but it you're concerned, call the consulting nurse at your doctor's office. It's what they're there for! Good luck!