Understanding moles: Types, risks and how to keep your skin safe

Written by Karla Renic, Lifestyle Editor at Yahoo! Style

A Toronto-based dermatologist says Canadians should be making self-examinations a habit

(Excerpt)

This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis or treatment. Contact a qualified medical professional before engaging in any physical activity, or making any changes to your diet, medication or lifestyle.

Those who spent much of the summer months under the sun may find new or changing moles that can sometimes cause concern.

While most moles are harmless, some have the potential to become cancerous.

As summer winds down, dermatologist and leader of Toronto's DLK on Avenue Dr. Lisa Kellett tells Yahoo Canada that Canadians should be making self-examinations a habit.

Read on for everything to know about these skin anomalies, how to self-examine them and when removal might be necessary.

What are moles and skin tags?

Moles, known medically as nevi, are pigmented lesions that can vary greatly in appearance and type.

Kellett explained moles are usually pre-programmed from birth and come in a multitude of forms. Some are present from birth while others develop over time due to various factors, including sun exposure.

"'Moles' just refers to pigmented lesions of the skin, although there are many different types," Kellett said.

"It's important to see a dermatologist to be able to properly diagnose what type of mole you're dealing with."

Melanoma Canada identified the following types, among others:

• Compound nevi: raised and skin-coloured

• Acquired nevi: appear during childhood or adulthood

• Blue nevi: blue-grey to blue-black moles, typically flat or dome-shaped with a smooth surface

• Intradermal nevi: skin-coloured or light brown dome-shaped lesions

• Splitz nevi: often pink, raised bump, but sometimes red, blue or black

Skin tags "are completely different," according to Kellett.

"They are not moles per se, although moles can masquerade as skin tags so that you can have what we call a 'pedunculated mole,'" she explained.

It might appear like a skin tag but contain benign cells, called nevus cells. Unlike moles, skin tags are not present from birth and tend to develop later in life.

How to self-examine moles

While most moles are harmless, some have the potential to become cancerous, that's why checking them out on a regular basis could be a life-saving measure.

"What I tell my patients is that we should be self examining moles once a month," Kellett claimed. "And what you're looking for is any change in size, shape, colour or border, or any new mole."

These characteristics, she explained, can indicate the presence of atypical cells.

"The ones that we really have to worry about are malignant melanoma — a type of skin cancer that can be deadly," she said.

According to the Canadian Cancer Society, people can follow the "ABCDE" rule when self-examining:

• A: Asymmetry, when one half doesn't match the other

• B: Border irregularity, when the mole has ragged or blurred edges

• C: Colour variation within the mole

• D: Diameter larger than a pencil eraser (usually more than 6 millimetres)

• E: Evolving or changing in size, shape, colour or elevation

Kellett's recommendation is to set a specific date each month for thorough checks, and consider photographing hard-to-see areas to monitor changes over time.

"Have someone take a picture of your moles with a little ruler underneath," she said.

She also recommended choosing a time that's easy to remember. For example, women can pick the first day they begin their period.

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