In the below image of a mole, its shape is slightly asymmetrical, but it is not a melanoma. B stands for border, because ...

There are more than 300 varieties of mole in Mexico, and although it’s one of the most famous Mexican dishes, it remains one of the most misunderstood preparations north of the border.

It's an asymmetric mole and there's a risk. Border: if the border of the mole is blurred. Color if there's more than just brown. If there's blue or black or red. And diameter: if it's a large mole ...