What Causes Swelling In The Left Leg Post A Gall Bladder Removal Surgery?

Hello. I am 22 years old. I had an emergency surgery to have my gall bladder removed 2 months ago. 2 weeks after surgery I got staph in the wounds. It went away 2 weeks later. Ever since then, I have been having extreme pain and swelling in my left leg and lower back. There is a lump on my shin (squishy not hard) and it is discolored and purple from the lump down to my ankle. There is also a small indention between the lump and my ankle. I ve been doing tests for 3 weeks and still no answers. I ve done an X-ray to see a fracture, no fracture. I ve done a venous Doppler on my leg, it came back normal. The pain is so bad I am having trouble sleeping at night. It goes numb/tingles at random times of the day, but always hurts. Idk what to do anymore