<s>[INST] had foot surgery 7 months ago and developed lump on incision,my dr. lanced it and squeezed out white pus. sent culture to lab came out negative for infection. However, it still oozes white pus and I m itchy all over my body which causes lesions. What s this? [/INST] Well there is definitely some nagging persistent infection and the causative organism is absent in the culture test because of intercurrent antibiotics; sometimes subculturing / culture from different area could help! Anyways, it could be tuberculosis especially atypical ones or some reaction to retained suture materials/ Chat Doctor. Please consult a good surgeon and a clean hospital...all the best! </s>