A close-up example of a mole

Moles, medically known as nevi, are growths on the skin that are usually tan, brown, or black. They can appear anywhere on the body, alone or in groups. Moles occur when the pigmented cells in the skin grow in clusters instead of spreading evenly throughout the skin. These cells are what give skin its pigment, so moles appear darker than the skin. It is also common for hairs to grow on the mole. Individuals with lighter skin tend to have more moles than those with darker skin, and most people with moles have between 10 and 40. Moles are generally harmless, but it is important to know that melanoma, the most serious form of skin cancer, can develop in or around a mole, so knowing your moles is essential to catching signs of cancer early.

Types of Moles:

There are several types of moles, and some carry greater risks of developing into melanoma than others.

  • Congenital Mole:

    Congenital moles are moles that a person is born with. About 1 in 100 people are born with one or more moles. These moles range in size, color and shape. Congenital moles that are considered large or giant are larger than 20 centimeters, and have been found to carry a greater risk of leading to melanoma.

  • Atypical Mole:

    Known medically as dysplastic nevi, atypical moles are usually larger than average (more than ¼ inch), and irregular in shape. They may contain uneven colors, or colors not typical of moles. Atypical moles can run in families, and some experts think these moles have a risk of developing into melanoma.

  • Acquired Mole:

    An acquired mole is one a person develops after birth. They are generally harmless, but people who acquire more than 50-100 moles are at greater risk for melanoma.


If Dr. Katsnelson tests a tissue sample and finds it to be cancerous, the entire mole and part of the tissue surrounding the mole will need to be removed. Or, if you would like a mole removed for cosmetic purposes, this is possible with another technique.  There are several methods to remove moles, all of which can be performed in our office. 


The best way to identify potential problems is to know the pattern and placement of your moles, and to examine them often. And if you have any questions or concerns, please contact a Dermatologist right away.

When monitoring your moles, remember the “ABCDE” method of self-examination:

  • “A” stands for asymmetrical shape. Watch for moles with asymmetrical shape, such as two very different looking halves
  • “B” is for border. Look for moles with irregular, ragged or blurred borders. This is one of the characteristics of melanoma.
  • “C” is for color. Look for moles that do not have the same color throughout, or contain shades of brown, black, blue, white, or red.
  • “D” is for diameter. Watch for moles that are larger than the size of a pencil eraser.
  • “E” is for evolution. Look for changes over time, such as a mole that grows or changes shape or color. 

If you notice any of the above irregularities in your moles, you should contact a Dermatologist right away. To further protect your skin, you should avoid the sun at peak hours and wear sunscreen (SPF>30).