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Melanoma/Skin Cancer Health Center

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Stages of Melanoma

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    Stage I

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    Stage I melanoma. In stage IA, the tumor is not more than 1 millimeter thick, with no ulceration (break in the skin). In stage IB, the tumor is either not more than 1 millimeter thick, with ulceration, OR more than 1 but not more than 2 millimeters thick, with no ulceration. Skin thickness is different on different parts of the body.

    In stage I, cancer has formed. Stage I is divided into stages IA and IB.

    • Stage IA: In stage IA, the tumor is not more than 1 millimeter thick, with no ulceration.
    • Stage IB: In stage IB, the tumor is either:
      • not more than 1 millimeter thick and it has ulceration; or
      • more than 1 but not more than 2 millimeters thick, with no ulceration.

    Stage II

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    Stage II melanoma. In stage IIA, the tumor is either more than 1 but not more than 2 millimeters thick, with ulceration (break in the skin), OR it is more than 2 but not more than 4 millimeters thick, with no ulceration. In stage IIB, the tumor is either more than 2 but not more than 4 millimeters thick, with ulceration, OR it is more than 4 millimeters thick, with no ulceration. In stage IIC, the tumor is more than 4 millimeters thick, with ulceration. Skin thickness is different on different parts of the body.

    Stage II is divided into stages IIA, IIB, and IIC.

    • Stage IIA: In stage IIA, the tumor is either:
      • more than 1 but not more than 2 millimeters thick, with ulceration; or
      • more than 2 but not more than 4 millimeters thick, with no ulceration.
    • Stage IIB: In stage IIB, the tumor is either:
      • more than 2 but not more than 4 millimeters thick, with ulceration; or
      • more than 4 millimeters thick, with no ulceration.
    • Stage IIC: In stage IIC, the tumor is more than 4 millimeters thick, with ulceration.

    Stage III

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    Stage III melanoma. The tumor may be any thickness, with or without ulceration (a break in the skin), and (a) cancer has spread to one or more lymph nodes; (b) lymph nodes with cancer may be joined together (matted); (c) cancer may be in a lymph vessel between the primary tumor and nearby lymph nodes; and/or (d) very small tumors may be found on or under the skin, not more than 2 centimeters away from the primary tumor.

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