What further tests are done after melanoma is diagnosed?

Depends: On size and location. Some times after resection, biopsy of lymph nodes and other imaging studies depend on stage of disease.

Risk factors dictate: The most important treatment step after diagnosis is to be seen and evaluated by someone experienced in melanoma care. Most often, surgery is the next step. For riskier cases, imaging studies like a pet scan may be indicated. The main point is to determine how risky the melanoma is and then tailor any tests performed and surgical decision making to this risk profile, .

Depends on risk: Depending on the melanoma characteristics and depth of the lesion, a wide local resection is performed to remove the melanoma, lymph nodes may be sampled through a procedure called a sentinel lymph node biopsy. And possibly further imaging will be ordered, such as a brain mri, ct scan, and a pet scan.