After a pilates class where I put weight on my left hand to do side pushups, the back of my hand along the metacarpal of my pinky finger swelled a bit. I went to PA-C, and he worried it was cellulitis, and Rx-ed Septra. I am 1/2 way into a 7-day course of that drug. Now, the general swelling has reduced, but the knuckle at the metacarpal-proximal phalange joint has a swelling about the diameter of a quarter that is raised 1/4 in.