<prompt> A 25-year-old female complains of a mole on her upper back. The lesion is 6 mm in diameter, darkly pigmented, and asymmetric, with a very irregular border. The next step in management is:Tell the patient to avoid sunlightFollow the lesion for any evidence of growthObtain metastatic workupObtain full-thickness excisional biopsy  <response>: Ans. D. Obtain full-thickness excisional biopsya. The lesion has characteristics of melanoma pigmentation, asymmetry, irregular border, and a full-thickness excisional biopsy is required. Shave biopsy of a suspected melanoma is always contraindicated.b. Diagnosis is urgent; the lesion cannot be observed over time. Once the diagnosis of melanoma is made, the tumor must then be staged to determine prognosis and treatment. 