I periodically get a discoloration and a lump in my middle finger. This lump is always located in the same spot, in the inside of the finger between the palm knuckle and the next knuckle (counting from the tip of the finger it would be located between the 2nd and 3rd knuckle). The lump is a little larger than a pencil eraser and can be moved around somewhat. The discoloration is always dark blue.
Does anyone have an idea of what this might be? Would this be something that requires attention or can I just forget about it? Any information would be appreciated.