Something showing on left lung on chest xray doc said could be infection have to have ct scan no symptoms except pain in left shoulder blade been ther?

Continue evaluation: Any lesion detected in the lung by imaging studies should be followed up by further detailed imaging, like ct scanning, etc. Then there may be a need for bronchoscopy with transbroncial biopsy, trans thoracic biopsy or even open surgery if necessary. But one step at a time. It sounds like you have an excellent doctor who is proceeding methodically to establish an accurate diagnosis.

Chronic: It sounds like there is a mass that could be concerning for chronic infection; the next step is indeed to better visualize it to see whether it is consistent with infection, or malignancy, or other disease process. Good luck!

More workup needed: A chest xray is a screening tool. If the abnormality cannot be easily explained (recent pneumonia, for example) and if the abnormality does not resolve on short interval (several weeks) followup chest x-ray, then further evaluation with a chest ct is warranted.