I've had this before and it seems to come and go.
I have small bumps on the knuckle closest to my palm. You can't see them but you can feel them if you touch the area, only sore when touched. They start out small and seem to get bigger and more sore and then dissappear.
Have googled this and all the results seem pretty far fetched as im only 18 and surely i couldn't have arthritis. Anyone?