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The information on this page was reviewed and approved by
Maurie Markman, MD, President, Medicine & Science at CTCA.

This page was updated on May 21, 2021.

What to do if you find a suspicious mole

It’s important to be aware of changes to your skin over time, as abnormal moles sometimes require medical treatment. Look over your body regularly to see if you notice any differences—if so, make sure you know what to do next.

While it’s true that skin cancer is the most diagnosed cancer in the United States, the good news is that it can almost always be treated if found early. Overall, skin cancer leads to less than 1 percent of all cancer deaths, according to the American Society of Clinical Oncology. Not all abnormal moles are cancerous, so if you suspect you may have skin cancer, seek advice from a doctor or dermatologist.

Skin cancer is categorized as one of two types: melanoma or nonmelanoma. Squamous cell carcinoma and basal cell carcinoma are both nonmelanoma types, while melanoma skin cancer is less common but faster growing.

What does an abnormal mole look like?

It’s normal to develop freckles, moles and sunspots throughout your life, especially as you age. However, it’s a good idea to examine your moles regularly, looking for anything suspicious.

Any mole you consider unusual should be examined by your doctor. It also helps to keep in mind the ABCDE rule for melanoma, which may help you know what you should be looking for.

  • Asymmetry: This is when a mole is abnormal in size, with the shape of one half not matching with the other half.
  • Border that is irregular: The edges of suspicious moles are ragged, notched or blurred in outline, while healthy moles tend to have more even borders. The pigment of the mole may also spread into the surrounding skin.
  • Color that is uneven: The mole may have various colors present, including black, brown and tan. Areas of white, gray, red, pink or blue may also be present.
  • Diameter: Has the mole increased in size? Melanomas may be tiny, but most are usually larger than the size of a pea (about 1/4 inch).
  • Evolving: This means the mole has changed over the past few weeks or months, either in size, shape or color.

If a mole fits into one of the above categories, it may be a suspicious mole that needs medical attention. If a mole doesn’t fit into any of the ABCDE categories, but you’re worried about it, ask your doctor to examine it.

What to do next

After discovering an abnormal mole, take action as soon as possible. First, make an appointment with your primary care doctor or dermatologist. He or she may examine the mole and ask a series of questions about your overall health and family history.

There are different risk factors for melanoma and nonmelanoma skin cancers.

Nonmelanoma risk factors include:

  • Long exposure periods to ultraviolet (UV) light from the sun and/or tanning beds
  • Fair skin complexion
  • Weakened immune system
  • Actinic keratosis
  • Previous radiation treatment 
  • Exposure to arsenic

Melanoma risk factors also include a fair complexion and prolonged exposure to UV light, in addition to the following:

  • History of frequent sunburns, especially at a young age
  • Large amount of big or small moles
  • Family history of unusual moles and/or melanoma
  • Race: Being white

Understand the diagnostic tests

After the visit to your doctor, additional diagnostic tests may be needed to learn more about the mole and assess possible treatment options.

Your doctor may use one or several of the following diagnostic tools.

  • Skin exam: The doctor physically examines your skin, looking for moles that are abnormal in size, texture or color. If you’ve noticed any moles that you’re concerned about, point them out to your doctor.
  • Skin biopsy: If more information is needed, the doctor may order a mole biopsy. There are four main types of skin biopsies.
    • Shave: A sterile medical razor blade is used to shave off part of an abnormal growth or mole.
    • Punch: An instrument called a trephine (or punch) is used to remove a circle of skin tissue.
    • Incisional: The doctor uses a scalpel to remove part of a mole or growth.
    • Excisional: The doctor removes an entire growth or mole with a scalpel.

If a mole is removed, a local anesthetic or topical cream may be administered to make the procedure more comfortable. It’s typically a quick procedure.