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This is Dr. Diego. I'm a physician from Boston with training in Internal Medicine, Pulmonary and Critical Care
Post nasal drip is a common problem in patients that have allergies. It's also called allergic rhinitis. The rust color is part of the inflammation most likely from the mucosa around your nose. Usually an intranasal steroid is used as the main treatment. If the PND persist intranasal atrovent could be use to decrease the PND. The history of cancer is unlikely to be related to this episode. You can check with your PCP, allergist or pulmonologist to have this treated.