I seem to get this almost everytime I pull out a hang nail from the corner of my finger. I usually wash it a lot and use peroxide on it. If that doesn't clear it up with in a few days then i get an antibiotic from dr. But I've only needed that once.
something similar happened to me a few months ago. i did'nt remember hurting my finger either but it swelled up and started getting red streaks. i got antibiotics for it and it was fine in a couple of days. take care. remar