Need more info: White patch could be old scar, fluid, infection, blood vessel, pneumonia, or even cancer. Where it is how big it is , the shape it is and your medical and social conditions will affect the identification process. Are you a smoker? Do you have cough? If there is low risk for infection or cancer - normally you just keep checking on the "spot: to make sure it isn;t growing.
Answered 9/28/2016
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