What Causes Soreness In Leg While Wearing Prosthetic Leg?

I M AN AK AMPUTEE, I WEAR A PROSTIC LEG. YESTERDAY I WAS HAVING DISCOMFORT AT THE BOTTOMOF MY LIMB. CAME HOME TOOK MY LEG OFF , ICE IT. WAS BETTER TODAY IN THE AM, BUT GOT VERY SORE QUICKLY AT WORK. HAD TO COME HOME TAKE IT OFF. HAVE BEEN ICING IT. WHAT ELSE CAN I BE DOING. ACTS LIKE A BONE BRUSE. BUT I M NOT SURE IF THAT IS WAHT IT IS??