What do you think of this lesion on the back?

This week's case discussion, submitted by Dr David Stewart, features an 84-year-old male who is a keen swimmer and has had multiple skin cancers (both melanoma and NMSC) in the past, hence the multiple scars.

The patient usually sees a dermatologist but presents to "have a few barnacles frozen off", at which time this marked lesion is noted on his back.

What do you think of it?

Update

Here is the pathology result.

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