I had a injury on my knee some 12 years  when I fell and I had 12 stitches. The wound healed up fine, but since then I had sore knee over the years. Just few months ago I had this boil kinda lump show up which had pus in it, the wound healed up but then it keeps coming back the lump with the pus in it, it just would not heal. The infection dries up but comes back on the same spot on the old stitch mark
Hi, Dear,Thanks for the query to My Chat Doctor Clinic. I studied your query in details and understood your health concerns.-Treatment and Cause of your lump on knee-a-Mostly it is-a retained/buried- stitch thread-which is causing Chronic Abscess with soreness and pus discharge.b-Other Cause of ? Osteomyelitis of the knee bones below the infected but healed stitched scar wound, needs to be ruled out by Dry KNEE with nearby wound area.c-I would advise-to consult ER Surgeon-who would remove the -buried stitch thread. ER orthopedic surgeon would treat it if there is Dry knee lead to treat Osteomyelitis of knee bones. This advice would help you to plan treatment with your doctor. Hope this resolves your query. Wellcome for further query in this regard. Have a Good Day...!! With Regards