ABCDE mole checker
Answer 5 questions about your mole using the criteria dermatologists use. Get an instant risk assessment.
Asymmetry
Is your mole symmetrical?
Border
How do the edges look?
Color
How many colors do you see?
Diameter
How large is it?
Evolution
Has it changed recently?
The ABCDE Rule — Visual Guide
The screening method dermatologists recommend for self-examination.
Asymmetry
One half does not match the other half
Normal
Both halves match
Warning
Halves don't match
Border
Edges are irregular, ragged, or blurred
Normal
Smooth, well-defined edge
Warning
Ragged, blurred edges
Color
Multiple colors or uneven color distribution
Normal
One uniform color
Warning
5+ colors mixed
Diameter
Larger than 6mm — about the size of a pencil eraser
Normal
Under 6mm
Warning
Over 6mm (pencil eraser)
Evolution
Any change in size, shape, color, or symptoms over time
Normal
No change over 12 months
Warning
Grew, darkened, irregular
Most important: Evolution (E) is considered the single most critical criterion. Any mole that is changing — in size, shape, color, or producing new symptoms like itching or bleeding — should be evaluated by a dermatologist regardless of other features. This guide is for screening only.
About this tool
The ABCDE rule (Asymmetry, Border, Color, Diameter, Evolution) is the standard self-screening method recommended by the American Academy of Dermatology. This tool guides you through each criterion. It is not a medical diagnosis — learn more about melanoma detection.