Final answer:
The next step if squamous cell carcinoma (CA) is suspected and a visible lesion is present would be to perform a biopsy.
Step-by-step explanation:
The next step if squamous cell carcinoma (CA) is suspected and a visible lesion is present would be to perform a biopsy. This involves removing a small sample of the lesion for examination under a microscope to confirm the diagnosis. A biopsy is the gold standard for diagnosing squamous cell carcinoma and provides important information about the extent and characteristics of the cancer. Once the diagnosis is confirmed, treatment options can be discussed, which may include surgery, radiation therapy, or other targeted therapies depending on the stage and location of the cancer.