Body filler is infected, please help (Photo)

I had filler done on my leg 8 years ago. Around 1.5 years ago I noticed the area where the filler was placed started getting darker and became painful to touch over time. I went to the doctors and was told it’s infected. They made incisions in my leg to drain the infection and gave me antibiotics via the drip. I have been on Surpax 400mg oral antibiotics for 6 months but my leg is healing extremely slowly and I am struggling to bend my knee. Is there any other treatments I can do to speed up th