BB-like lump on top of knuckle
I've suddenly developed a lump on the top left side of the knuckle of my left index finger. The shape, size and hardness are like a bb under the skin of my knuckle, but it seems to be attached to the knuckle, not free moving. There's some mild soreness to the touch or when I bend the knuckle, but not otherwise. Because I'm solidly right-handed, this finger doesn't get a lot of use, and I don't recall any events that might have induced an injury. It just appeared spontaneously (or at least I just discovered it without being able to relate it to anything). I know this complaint is nothing compared to some of the concerns I see reported here, but I'm curious if this rings a bell with anyone. Thanks for any info you might offer.