Hi and thank you so much for this query. I am so sorry to hear about this pus formation. This is suggestive of a chronic infection and am afraid this may be chronic osteomyelitis. if there is still any foreign material in there, it would need to be taken out. A culture of deep tissue taken from the draining site would identify the germ and antibiotics that can take care of this condition. Treatment would be a long process and may go up to as many as 6months. Talk to your doctor for review, removal of any foreign materials and culture of tissue from the draining site for best management. I hope this helps. I wish you well. Thank you so much for using our services and do feel free to ask for more information and clarifications if need be.