One half of the mole does not match the other half.
Irregularity: The edges of the mole are ragged or notched.
The color over the mole is not the same. They may be different
shades of tan, brown, or black, and sometimes red, blue, or white.
The mole is wider than about ¼ inch, although doctors are finding
smaller melanomas in recent years.
melanomas do not fit the ABCD rule described above, so be aware
of changes in your skin and see a doctor if you have questions.