Seborrheic Keratoses (SK) & Dermatosis Papulosa Nigra (DPN)

What is Seborrheic Keratoses (SK)

Seborrheic Keratosis | Calgary CASeborrheic Keratosis (SK) are raised growths on the skin. There may be just one or clusters of dozens. They usually start off light tan in color, and they may darken to dark brown or nearly black. They vary in size from a few millimeters to several centimeters. Our doctors at the Remington Laser Dermatology Centre, our doctors have both the equipment and knowledge to help give your skin the look and feel it deserves.

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Is Seborrheic Keratoses Cancerous?

They have NO relationship to skin cancer and DO NOT pose a risk to health. Unlike moles (nevi), they can never turn into melanoma. As people age, they may simply develop more, and some people grow more than others. Sometimes seborrheic keratoses may erupt during pregnancy, following hormone replacement therapy, or as a result of other medical problems. They are often genetic and can be traced to other family members who have been affected. There is no direct correlation to sun exposure, and we often refer to them as “weeds”, as you will continue to develop more over time.

Is Seborrheic Keratoses Contagious?

These are not contagious and do not spread.

What Does Seborrheic Keratoses Look Like?

Seborrheic Keratoses

Characteristics of Seborrheic Keratoses

Stuck on – They are classically described as looking like someone took clay or a piece of dirt and “stuck” it on the skin. The edge of the SK is not usually attached to the underlying skin making it appear that it could be removed by picking it off with your fingernail. This is because SK arise from the epidermis or top layer of the skin. They do not extend deep into the skin like warts.

Warty surface – SK may look like warts but they do not contain the human papillomavirus that causes warts.  As they develop some can have a very rough surface with deep pits and fissures.

Smooth surface with horn pearls – Some SK do not have a rough surface. If they are smooth, they contain tiny bumps that look like seeds that are lighter or darker than the surrounding tissue. These are called horn pearls and they are actually bits of keratin that develop in a whirling, circular pattern.

Itching – For some reason, SK tends to itch especially the older we get. Some people will unintentionally manipulate or “pick at” an SK and cause it to be further irritated.  If irritated enough, the skin around it can become red and the SK itself can bleed.

Seborrheic Keratoses Treatment in Calgary, AB

Although these lesions are completely benign, many find them to be irritating or cosmetically bothersome so they chose to have them removed. Some smaller lesions can be removed with liquid nitrogen, but most larger lesions are best removed with the Co2 Laser. The Co2 laser gives an excellent cosmetic result in people who desire the removal of these lesions.

What Our Patients Have to Say


“I have seen Dr. Remington sporadically over the past 15 years, he has always been extremely professional, knowledgeable and patient with with me and the procedure or treatment I was considering. He and his staff are arguably the best in Calgary. I would highly recommend Dr. Remington for all of your skincare needs!”

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What is Dermatosis Papulosa Nigra?

DPN Remington Laser

Dermatosis papulosa nigra (DPN) is characterized by the presence of multiple, small, 1-5 mm diameter, firm, black or dark brown papules on face and neck. They are a sub-type of benign seborrheic keratosis and occur among African Americans, Asians and Polynesians. There tends to a genetic correlation and they appear more in females than males.

DPN’s usually start to appear in late adolescence and the number and size of lesions increase with age. The spots primarily occur on the cheeks and forehead, but can also be found on the neck, upper back, and chest. The actor Morgan Freeman is well known for these lesions on his face. DPN’s do not cause any symptoms of pain or itching, but many consider them to be cosmetically unsightly. They have no cancerous potential, so removal is for cosmetic purposes only.

How is DPN Treated?

DPN’s can be removed effectively with the Ultrapulse Co2 laser. The lesions are frozen with a topical and/or injectable anesthetic and then the laser is used to systematically ablate the unwanted tissue. Because these lesions remain on the surface of the skin (similar to a “barnacle”) once treated with the laser, they can be gently sloughed off with a q-tip. Following removal, there will be small open areas that will need to heal over the next 7-10 days.

What Should I Do After My DPN Treatment?

During the healing process and for several months following, it is ESSENTIAL to use daily sun protection to avoid darkening of the treated area. Oftentimes these lesions often cover a large surface area, so we will choose a “zone” to focus on during each procedure. As these are a genetic condition, more lesions may develop over time and may require ongoing treatment.

Schedule a Consultation

To learn more about our treatment for Seborrheic Keratoses, contact Remington Laser Dermatology Centre today. To contact Dr. Kent Remington, call 403-252-7784. To call Dr. Todd Remington, call 403-255-1633.

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Our Office

Remington Laser Dermatology Centre
150 - 7220 Fisher Street SE
Calgary, AB T2H 2H8

Dr. Kent Remington ( Mon – Wed )

Tel: 403.252.7784 | Fax: 403 259 5245

Dr. Todd Remington ( Mon – Fri )

Tel: 403.255.1633 | Fax: 403 259 5245

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