How would you manage this lesion on the shoulder?

In this week's case discussion, from Dr John O'Bryen, we look at a 78-year-old lady who has previously had a melanoma in situ on her cheek. During her skin check, this prominent brown macule is noticed.

What is your diagnosis, and what would you do next?

Update

An excisional biopsy reports a superficial spreading invasive melanoma with
Breslow thickness 0.3mm.

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