Early-stage melanoma (0, 1, or 2) generally means your prognosis is good. Stages are how healthcare providers determine how ...

This is also called melanoma in situ. Stage 1 melanoma has two distinct categories: 1A: The tumor is less than 1 millimeter (mm) thick and may be with or without ulceration. 1B: The tumor is ...

Stage 0 melanoma is not the same as Stage 1 melanoma, which is more advanced. In Stage 1, the tumor is less than 2 milimetres (mm) thick and may be either ulcerated or not ulcerated. As with stage ...