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if you have a fever and are coughing up thick sputum, you should see a doctor...it sounds like you have pneumonia -- if you smoke, then stop smoking. usually a minor viral 'chest cold' will not cause us to bring up so much phlegm or produce much of a fever at all past a day or 2.
other possibilities are reactive airway disease (similar to asthma) or bronchitis or a blood clot i your lung -- all of which you need to see a doctor for, so...go see one!
as far as the lump, i am not sure what you are referring to -- if it is in the muscle layer, it could be a muscle spasm due to the coughing/pneumonia/sitting differently than usual from being ill....it could also be a skin infection or growth -- but that doctor can look at it for you!