Chest CT scan show multiple tracheal and bronchial polyps less than 6mm size? Old CT before a year show one polyp but no change in size? Is it cancer

As below. Most of the times these are benign squamous cell papillomata from over proliferations of squamous epithelium lining of the air tree. These are usually occur due to infection of the mucosa with HPV 6 and 11 (possibly also 16 and18). Have you had any biopsy yet? Have you had any complications yet like mucus plugging, lung infections atelectasis, bronchiectasis etc?