The skin cancer most likely to metastasize is cancer of the melanocytes.

a. true

b. false

It is False. The skin cancer that is most likely to metastasize is not the cancer of melanocytes instead, it is known as the squamous cell carcinoma. 

Squamous cell carcinoma is usually malignant in growth and develops from the scale-like epithelial tissue.  This kind of growth is the most potential for the metastasis to the lymph nodes, which is now known as the squamous cell carcinoma.  This type of cancer usually becomes more severe due to the excessive exposure to the sunlight.

However, malignant melanoma from melanocytes is considered as the most deadly kind of skin cancer and is usually hereditary in origin.  This cancer is more common in men redheads and is usually treated surgically.

b is the correct answer