I have no history of TB but I had a previous abnormal chest xray that showed opacity at the left apex suggestive of pulmonary TB. Further sputum test was done and result was negative. I went for an independent opinion and a second chest xray was done and the xray result was normal. Two years later i was required to do a medical check up for visa and was told that my xray showed an old scar. I did blood test and sputum test and both results were negative. I was called for discussion about my medical history and I confirmed I had no TD history. I was recommended to do a skin test that was 16mm in size. The medical report stated that I had traces of OLD TB but I do not have a history of TB. Doctors kindly advise