Final answer:
Melanoma is the type of skin cancer most likely to metastasize, compared to basal cell carcinoma and squamous cell carcinoma.
Step-by-step explanation:
Of the skin cancers reported by this client, melanoma is the most likely to metastasize. Basal cell carcinoma, while being the most common type of skin cancer, rarely spreads beyond its original site. Squamous cell carcinoma does have potential to metastasize, but not as frequently as melanoma. Melanoma occurs in the melanocytes of the epidermis and is the most aggressive form of skin cancer. It causes the vast majority of skin cancer deaths due to its ability to spread rapidly to other parts of the body if not treated at an early stage.