A few days ago, a hard immobile bump appeared on the back of my hand (barely seen but very obviously felt). Technically it may have been there a bit longer, but I usually notice things like this. Anyways, it is on the metacarpal of the pointer finger, and wraps around the side of the bone on the "thumb" side. It's about midway between the wrist and knuckle, making me thing it probably isn't a ganglion cyst. It causes very slight discomfort when I pull my finger toward my palm and is not affected by any wrist movement.
Any ideas? Thanks!