Chest xray is not a good way to confirm lung lesion. CT scan
of the chest will help you confirm if there is or not. So go for it to settle the matter for good. If the pea size lesion is more than 3 cm in size, with no other abnormality in the lung, depending upon the characteristic of the lesion, your smoking
history and age you have to decide if you will need biopsy/ diagnostic cum therapeutic surgery. Bottom line is you need to get the CT done for sure unless you have a very good reason not to.