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Use the ABCDE rule—Asymmetry, Border, Color, Diameter, and Evolving—to spot warning signs of melanoma at home. Carolyn Stull, MD, FAAD, at MDCS Dermatology provides expert skin checks. Book your skin exam today to stay ahead of skin cancer.
Skin cancer is the most common cancer in the U.S., and melanoma is the most serious type. At MDCS Dermatology, we emphasize the importance of regular self-checks to catch suspicious moles early. The ABCDE rule is a simple way to evaluate moles at home and identify warning signs of melanoma.
What Are the ABCDEs?
- A – Asymmetry
One half of the mole doesn’t match the other. - B – Border
Edges are irregular, blurred, or scalloped. - C – Color
Varies in shade or includes different colors such as brown, black, red, or blue. - D – Diameter
Larger than 6 mm (about the size of a pencil eraser), though melanomas can be smaller. - E – Evolving
Changes in size, shape, color, or any new symptoms like itching or bleeding.
Why Self-Checks Matter
Monthly self-exams help you notice new or changing lesions early. Use a mirror or ask a loved one to check hard-to-see areas like the back, scalp, or behind the ears.
When to See a Dermatologist
Any mole that fits the ABCDE criteria—or just feels “off”—should be evaluated by a board-certified dermatologist. Carolyn Stull, MD, FAAD at MDCS Dermatology offers expert skin cancer screenings using advanced tools to detect changes early.
Schedule a Skin Exam
Annual professional skin checks can save lives. Book your appointment online with the trusted team at MDCS Dermatology to ensure your skin stays healthy year-round.