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Have you ever noticed dark spots on your skin and wondered if they’re just ordinary moles or something that requires more attention? Understanding the difference between normal moles and atypical nevi (also called dysplastic nevi) is important for maintaining your skin health and potentially catching skin cancer in its early stages.
While most moles are completely harmless, atypical nevi can sometimes be precursors to melanoma, the most dangerous form of skin cancer. Keep reading to discover the key differences between normal moles and atypical nevi and learn when you should consult with a dermatologist at Calkin & Boudreaux.
What Are Normal Moles?

Normal moles, also known as common nevi, are small growths on the skin that develop when pigment cells (melanocytes) grow in clusters. These growths are usually brown, black, or skin-colored and can appear anywhere on the body, either alone or in groups.
Most people have between 10 and 40 moles on their body, with many developing during childhood and adolescence. Normal moles typically remain stable in appearance throughout your life, although some changes can occur with age, pregnancy, or sun exposure.
Dr. Daniel J. Aires, a dermatologist at Golden State Dermatology, explains the nature of common moles:
“Normal moles represent a natural clustering of pigment-producing cells in the skin and are incredibly common in the general population. The average person develops dozens of moles throughout their lifetime, with most appearing before age 30, and these benign growths rarely pose any health concerns. What’s important for patients to understand is that normal moles maintain consistent characteristics — they’re usually symmetrical, have regular borders, uniform color, and remain relatively small. When patients know what their normal moles look like, they’re better equipped to recognize when something unusual develops, which is key to early detection of potential skin cancer.”
What Do Normal Moles Look Like?
Normal moles typically share several common characteristics that help distinguish them from atypical nevi. Knowing these features can help you recognize what’s normal on your own skin.
Most normal moles are smaller than 6 millimeters in diameter (about the size of a pencil eraser). They tend to be round or oval with well-defined borders and even coloration throughout, usually in shades of brown, tan, or black.
The surface of a normal mole may be flat or slightly raised, and the texture is generally smooth. Normal moles maintain a consistent appearance over time, though slight changes may occur over decades.
What Are Atypical Nevi?
Atypical nevi, also called dysplastic nevi, are unusual-looking moles that may share some characteristics with melanoma. These moles appear different from common moles and may have irregular features that make them stand out. Regular monitoring of these moles by a dermatologist at Calkin & Boudreaux is essential for early detection of any concerning changes.
Characteristics of Atypical Nevi
Atypical nevi often have several distinguishing features that set them apart from normal moles. Dysplastic nevi are often larger than normal moles, frequently exceeding 6 millimeters in diameter. They typically have irregular borders that may appear notched, blurred, or poorly defined, giving them an asymmetrical appearance.
The color of atypical nevi is usually not uniform and may include various shades of brown, tan, red, pink, or even blue-black within the same mole. These moles might have a darker center and a lighter, irregular border.
Sandra Kemptner, PA-C, at Golden State Dermatology, shares insights about recognizing atypical nevi:

“When examining patients with atypical nevi, I often emphasize the importance of the ‘ugly duckling’ sign – looking for moles that stand out from the rest. Atypical nevi often appear noticeably different from a person’s other moles, with features like irregular borders, variable coloration, or asymmetrical shapes that catch our attention during skin examinations. What’s particularly challenging about these lesions is that they can mimic melanoma, making regular professional evaluation crucial for patients with multiple dysplastic nevi. We recommend patients with atypical moles schedule regular skin checks and practice monthly self-examinations using good lighting and a full-length mirror to monitor for any concerning changes.”
The ABCDE Rule for Evaluating Moles
Dermatologists often recommend the ABCDE rule as a helpful guideline for evaluating moles that might be problematic. The “A” stands for asymmetry, where one half of the mole doesn’t match the other half. Normal moles are typically symmetrical, while atypical nevi and melanomas often have irregular shapes.
“B” refers to border irregularity, with atypical nevi having uneven, notched, or blurred edges. “C” represents color variation, as atypical nevi may display multiple colors or shades within a single mole.
“D” stands for diameter, with atypical nevi often larger than 6mm. “E” represents evolution or changes in a mole’s appearance over time, which is perhaps the most important factor to monitor.
When Should I See a Dermatologist?
Regular skin examinations by a dermatologist are recommended for everyone, especially those with risk factors for skin cancer. However, certain situations warrant prompt medical attention from a specialist at Calkin & Boudreaux.

Any new mole that appears after age 30 should be evaluated, as most normal moles develop earlier in life. Changes in existing moles, including growth, color changes, or the development of symptoms like bleeding, itching, or tenderness, should also prompt a visit to your dermatologist.
If you notice a mole that stands out from others on your body or one that matches any of the ABCDE criteria, schedule an appointment right away. Early detection of problematic moles can significantly improve outcomes if skin cancer is present.
How Are Atypical Nevi Diagnosed and Treated?
Diagnosis of atypical nevi typically begins with a visual examination by a dermatologist, who may use a dermatoscope (a special magnifying device) to get a closer look at suspicious moles. If a mole appears concerning, your dermatologist at Calkin & Boudreaux may recommend a biopsy, which involves removing all or part of the mole for examination under a microscope.
This procedure is usually performed with local anesthesia in the office and takes just minutes to complete. Treatment depends on the biopsy results and may range from continued monitoring to complete surgical removal of atypical moles. Your dermatologist will discuss the best approach based on your specific situation and risk factors.
Early detection of problematic moles is crucial for successful treatment outcomes. When caught early, atypical nevi that show signs of developing into melanoma can be removed before they become dangerous.
Regular skin examinations, both at home and by a dermatologist, play a vital role in early detection. By familiarizing yourself with the characteristics of normal and atypical moles, you can become more proactive about your skin health.
Schedule Your Consultation Today
If you’ve noticed unusual moles or changes in existing moles, the experienced team at Calkin & Boudreaux can help. Our dermatologists are experts in diagnosing and treating all types of skin growths, including atypical nevi that may require special attention. With early detection and proper treatment, most skin cancers can be successfully treated.
If you have questions about your skin, schedule an appointment at Calkin & Boudreaux today!