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What determines how deep melanoma is?

The Clark levels are used to describe how deep the melanoma has spread into the skin:

    • Level I: The cancer is in the epidermis only.
    • Level II: The cancer has begun to spread into the papillary dermis (upper layer of the dermis).
    • Level III: The cancer has spread through the papillary dermis (upper layer of the dermis) into the papillary-reticular dermal interface (the layer between the papillary dermis and the reticular dermis).
    • Level IV: The cancer has spread into the reticular dermis (lower layer of the dermis).
    • Level V: The cancer has spread into the subcutaneous layer (below the skin).

This answer is based on source information from the National Cancer Institute.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.