Cancer Screening & PreventionFebruary 4, 2026·5 min read
By the CIRRUS Editorial Team — how we write and source this
Skin checks: what a dermatologist actually looks for
The "ABCDE" rule gets cited often. Here's what's actually behind each letter, and what dermatologists check beyond it.
The ABCDE framework — Asymmetry, Border irregularity, Color variation, Diameter over 6mm, and Evolution (change over time) — is a starting screening heuristic for melanoma, not an exhaustive diagnostic checklist a dermatologist relies on alone.
"Evolution" is often the most clinically weighted factor in practice: a mole that's changing in size, shape, or color over weeks to months is a more significant flag than one that simply looks unusual but has been stable for years.
Dermatologists during a full-body skin exam are also checking areas patients commonly overlook in self-exams — scalp, between toes, soles of feet, and skin folds — since melanoma and other skin cancers can develop in sun-protected areas, not exclusively sun-exposed skin.
A dermatoscope — a specialized handheld magnifier with polarized light — allows a dermatologist to examine pigment patterns beneath the visible skin surface, which is why an in-office exam catches details a self-exam or photo comparison alone typically can't.
This article is general health information, not medical advice, and doesn’t replace evaluation by your own physician. Talk to a doctor about anything specific to your own diagnosis or treatment.