I have two lumps under my skin on my lower back..when i bend my back and run my back i can feel it. they feel rubbery and move easily but they dont hurt?

Low back lumps: A physician would have to examine these lumps in order to make a diagnosis and advise you. If they are freely movable, they are not attached to bone and could be benign fatty tumors called lipomas.

Benign lesions: Most likely, these moveable lesions are sebaceous cysts or possibly lipomas. If there is any secretion from them, a cyst is most likely. Sometimes these drain a foul smelling liquid. Advise to confirm with visit to dermatologist, who can surgically remove if they bother you.