Medical Questions? Ask a Doctor Online!
Hello and welcome to justanswer!
The lump you have seems to be a ganglion.A ganglion is a small lump which develops next to a joint on the tendons etc.I develops by the lubricating fluids of the joints or tendons and it gets concentrated , with a sheath around , and moves with or without pain. It is a mucous cyst.It needs surgery if it causes pain or hinders normal function of hand , otherwise , it is harmless and needs no surgery.I will advise you to see a general surgeon.
Hope i have answered your question.