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Hello Richard I'm Dr Chip
Any cough or fever?
Any tenderness in that area?
OK--let me know
Most likely this is a simple case of pleurisy--inflammation of the lining of the lung
But it could be pneumonia or bronchitis so he needs to see a doctor for an exam and a chest x-ray to check that
Please let me know if you need any more information
My pleasure and call on me anytime