I must always have something

I went running last week, in preparation for the summer purge. Apparently my sneaker didn't fit right, or folded wierd, because the second toe of my left foot is all red and swollen and tender, like it's infected, but there's no cut.
I expected it to go away, but it's been a week now.
I'm taking some time off soon, so I guess I'll schedule an appointment. If it hasn't gone away by then, something is definitely wrong.