Case of the month-A scalp lesion with anaemia?

Melanoma_stitched

A 79 year old man underwent a upper GI endoscopy for dark stools and anaemia (top left), histology from lesions (top right) is presented. Further examination revealed a scalp lesion (bottom left), which was also biopsied (bottom right). What is the unifying diagnosis?

Submitted by GJ Webb.

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