I have a lump in my right arm to the left of my elbow its hard and hurts a lot what should I do no trama there is 4 of them total and there pretty big?

Arm Lump. Lumps under the skin can be caused by a number of conditions. Causes can include benign (harmless) cysts, lipomas (harmless fatty growths), and infections on the surface of the skin of the armpit. Lumps may be produced by enlarged lymph nodes. See your general surgeon for removal.