Going for skin scanning tomorrow to make sure melanoma is not in other areas. What should I expect?

What does the doctor due during the full body scan? Does he remove any more moles that look like they can be melanoma? I just had surgery done two weeks ago on my arm to remove the melanoma and upon removing the stiches the doctor will due the scan. I am just worried that there will be more affected areas. I had a mole removed last year and it came back recently. Can that be another spot of melanoma?