What is the treatment for pain in hand due to swollen vessel in the middle of my left hand on the bottom?

?diagnose: without a photo or an examination, your problem cannot be diagnosed here. Resubmit with clear, distinct photos.

Thrombophlebitis: Thrombophlebitis is the name for pain and inflammation of a blood vessel. The treatment is antiinflammatories like ibuprofen and warm compresses. It is not dangerous, self limited, and should resolve on its own. Hope this helps!