Final answer:
Melanoma characteristics are Asymmetry, Irregular Borders, Color variation, Diameter greater than 6 mm, and Evolving nature. These are summarized by the ABCDE mnemonic. Nodular melanoma also presents as Elevated, Firm, and Growing.
Step-by-step explanation:
The characteristics of a melanoma include Asymmetry, meaning the two sides are not symmetrical; Irregular Borders, where the edges of the melanoma are jagged or notched; Color variation, indicating varied shades of brown or black within the lesion; a Diameter that is larger than 6 mm, which is roughly the size of a pencil eraser; and an Evolving nature, meaning that the lesion changes in size, shape, or color over time. These characteristics are crucial for early detection and are remembered by the ABCDE mnemonic used by doctors. For nodular melanoma, which is a more serious form, additional signs include being Elevated, Firm to the touch, and Growing in size.