You should definitely see your doctor, without delay, for examination and a chest X-ray. The pain you described, pleurisy from the description, could well be on the basis of surgical scarring. However, it could also be a reflection of a recurrence of the problem that required the lobectomy or a late-developing surgical complication.
Because of the possibility of the last two, more serious problems, you should not wait any longer to give your doctor the opportunity to diagnose what is going on.
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