Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Linear fibrotic band is suggestive of old, healed lesion. You might be having tuberculosis or pneumonia in the past which gives this scarred lesions on healing. These kind of lesions are inactive, noninfectious. So no treatment is required. These lesions are seen life long. For visa purpose, you should consult pulmonologist and get done CT thorax and bronchoscopy. If both these are negative for active infections then you can argue with Visa authorities. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.