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Early signs of melanoma are changes to the shape or color of existing moles or in the case of nodular melanoma the appearance of a new lump anywhere on the skin (such lesions should be referred without delay to a dermatologist). At later stages, the mole may itch, ulcerate or bleed. Early signs of melanoma are summarized by the mnemonic "ABCDE":

  • Asymmetry
  • Borders (irregular)
  • Color (variegated), and
  • Diameter (greater than 6 mm (0.24 in), about the size of a pencil eraser)
  • Evolving over time

These classifications do not however apply to the most dangerous form of melanoma nodular melanoma which has its own classifications:

  • Elevated above the skin surface
  • Firm to the touch
  • Growing.
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