ABCDE Mole Check Guide
A simple, free way to learn the five warning signs dermatologists use when looking at a mole or spot — and how to check your own skin.
This is an educational guide, not a diagnosis or medical advice. Only a healthcare professional can evaluate a mole. If a spot is new, changing, or worries you, see a doctor.
ABCDE Skin Self-Check
A quick guided walk-through of the warning signs — educational, not a diagnosis
Are the two halves uneven?
Imagine a line through the middle — one half doesn't match the other.
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What is the ABCDE rule?
The ABCDE rule is a memory aid used by dermatology organizations to describe the warning signs of melanoma, the most serious form of skin cancer. It stands for Asymmetry, Border, Color, Diameter, and Evolving. No single sign means a spot is dangerous, and a worrying spot can have none of them — the goal is simply to help you notice changes worth getting checked.
How to do a skin self-exam
Once a month, in good light, look over your whole body including your scalp, between your toes, and your back (use a mirror or ask someone to help). Note any spot that is new, looks different from your other moles, or has changed. Taking a photo each month makes changes easier to spot over time.
When should you see a dermatologist?
See a healthcare professional for any spot that is changing, itching, bleeding, not healing, or that simply looks different from the rest. When in doubt, get it checked — early evaluation is always the safe choice. Rash Detector can help you keep track of your skin between visits, but it does not replace a professional exam.