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    Melanoma Treatment (PDQ®): Treatment - Patient Information [NCI] - Stages of Melanoma

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    Stage 0 melanoma in situ. Abnormal melanocytes are in the epidermis (outer layer of the skin).

    In stage 0, abnormal melanocytes are found in the epidermis. These abnormal melanocytes may become cancer and spread into nearby normal tissue. Stage 0 is also called melanoma in situ.

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    Millimeters (mm). A sharp pencil point is about 1 mm, a new crayon point is about 2 mm, and a new pencil eraser is about 5 mm.

    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.
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