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As you have described you are having some kind of possible chest wall swelling. It could be unrelated to the cough
and sputum but it would be better to get it examined by a Doctor. The coughing and phlegm could be due to respiratory infection. You can do steam inhalation for some relief. If the sputum turns yellowish you may need antibiotics as recommended by your Doctor. Eat healthy. Drink plenty of fluids. Exercise daily.