"Ugly duckling" sign
In addition to the abcd/e acronym described by dr. Bowman, there is another way to watch for melanomas called the "ugly duckling" sign.
The idea is that if a spot looks different than the other spots on your body (i.G., the ugly duckling of the family), it is more likely to be a cancer
. The bottom line: "when in doubt, get it checked out.".