16/10/2026
Most people know to keep an eye on their moles, but not everyone knows what they're actually looking for.
The ABCDE rule is a simple place to start:
A – Asymmetry: one half doesn't match the other
B – Border: edges that are uneven, notched or blurry
C – Colour: more than one shade, or a colour that's changed
D – Diameter: larger than 6mm (about the size of a pencil top)
E – Evolving: anything changing in size, shape or colour
Any one of these is worth a second look. More than one, and it's time to book a check.