Actinic Keratosis

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What is it?


Symptoms And Complications

How to diagnose?

Treatment and Preventions


What is Actinic Keratosis?

Actinic keratosis (AK) is a lesion that forms on sun-damaged skin. The lesions are small scaly patches on parts of the body, such as the face, ears, bald scalp, arms, and hands, which have been chronically exposed to the sun.

AK is a precancerous condition that affects only the top layer of skin (the epidermis). Ultraviolet (UV) rays from the sun damages the skin and if left untreated, 15% of AK can turn into a form of Skin Cancer called squamous cell carcinoma (SCC). When they are found early, AKs are highly treatable.

AK is more common in people with fair skin. It is found in 15% of people in North America and Europe. Australia has the highest rate of AK in the world.

What causes Actinic Keratosis?

UV light from the sun and commercial tanning lamps or beds are the major causes of AK. UV light causes changes in the genetic material of the skin's cells. Changes in certain genes can cause cells to grow abnormally and form lesions.

Risk factors include:

  • age 40 and older – AK can happen at any age, but the risk increases with accumulated sun exposure
  • immunosuppression – the body's ability to recognize and fight abnormal cells are lowered in people with weak immune systems (e.g., as a result of taking organ transplant medications or chemotherapy, or having AIDS), so cells with gene changes are allowed to grow and form lesions
  • men – they tend to work outdoors and have more sun exposure than women
  • people with fair skin – also people who have red or blonde hair and those who tend to burn rather than tan develop AK more easily
  • sun exposure – people who work outdoors or have more exposure to the sun are at higher risk

Actinic Keratosis Symptoms And Complications

AK lesions are small scaly patches that can be flat or slightly raised. They can range in colour from one's skin tone to a reddish-brown colour. They are about 3 mm to 10 mm across and may gradually enlarge. The skin around the lesions may show other signs of sun damage such as dark blotching, broken blood vessels, and a yellowish tinge.

Over time, AK lesions may become thicker and harder. Their colour may change from red to brown. Sometimes, a cone-shaped growth occurs above the skin surface at the site of the lesion. This is called a cutaneous horn.

The most common site for AK is the face, but it can occur anywhere on the body that has had long-term sun exposure, such as the arms, legs, and back of the hands. Sunbathers, for example, may develop AK on other parts of their bodies.

The most significant complication of AK is skin cancer. Once the AK lesion invades the lower layer of the skin (dermis), it is classified as squamous cell carcinoma (SCC), a form of cancer. If not treated, the cancer may spread to other areas of the body. Lesions that are more red, raised, and firmer than other AK lesions are more likely to become skin cancer.

How to diagnose Actinic Keratosis

AK can look similar to other skin conditions such as psoriasis or skin cancer. Your doctor can usually diagnose AK with a physical examination, but the most definitive way to make a diagnosis is to do a skin biopsy. A biopsy removes a small piece of tissue for testing. Biopsies may also be used to check lesions that have come back after treatment or that did not respond to treatment.

Actinic Keratosis Treatment and Preventions

There are several options available for treating AK. Which one is best will depend on factors such as the size and location of the lesions, the number of lesions, and the person's overall health.

Cryotherapy uses a very cold substance, like liquid nitrogen, to freeze and kill the skin cells that make up the AK lesion. The liquid nitrogen is applied as a spray or with a swab. This treatment method is best for a small number of lesions. Topical medications (see below) may be used prior to cryotherapy to improve results.

Excision is surgical removal of the lesion using a sharp blade.

Electrodessication and curettage dries out the AK cells with an electric current and then scrapes them out using a curette (a sharp instrument). These procedures require a local anesthetic. Like cryotherapy, these are not practical for large numbers of lesions.

Topical medications (medications that are applied to the skin) can be used to treat actinic keratoses and superficial basal cell carcinoma (sBCC). Topical medications include 5-fluorouracil* (also known as Fluorouracil or 5-FU) and Imiquimod.

  • 5-FU belongs to the group of medications known as topical antineoplastics. It works by interfering with cancer cell growth. It is applied to the skin in a thin layer and is then covered. The treatment is repeated daily over several weeks. This method is good for treating large areas of skin. Women who are pregnant should not use 5-FU.
  • Imiquimod is another topical medication for the treatment of AK. It belongs to a group of medications called immune response modifiers. This type of medication works by stimulating the immune system to produce substances that fight against the cancer. The treatment is applied to the skin twice a week for 16 weeks. This method is good for treating larger areas of skin.
  • Ingenol mebutate is another topical medication for the treatment of AK. It works by killing skin cells and by causing inflammation where it is applied. The treatment is applied to the skin once daily for 2–3 days depending on the location of the AK.

Photodynamic therapy (PDT) uses light and a light-sensitizing medication to kill AK skin cells. The medication is applied to the skin and is absorbed by the abnormal AK cells more than the normal surrounding cells. The skin is then exposed to a specific colour of light that activates the medication and kills the cells. PDT is good for treating large areas of skin with many AK lesions.

Other possible treatments include:

  • chemical peels
  • dermabrasion
  • laser treatment
  • other topical medications (e.g., Diclofenac)

The best way to prevent AK is to avoid overexposure to the sun. Use a sunscreen with a sun protection factor (SPF) of at least 15, applied one-half hour before sun exposure and reapply every 2 hours. Wear a hat and protective clothing to help protect your skin from the sun's UV rays. Remember to protect children as well. Try to stay out of the sun during peak hours (11 am to 4 pm). It's important to make sure your sunscreen protects against both UVA and UVB rays.

*All medications have both common (generic) and brand names. The brand name is what a specific manufacturer calls the product (e.g., Tylenol®). The common name is the medical name for the medication (e.g., Acetaminophen). A medication may have many brand names, but only one common name. This article lists medications by their common names. For information on a given medication, check our Drug Information database. For more information on brand names, speak with your doctor or pharmacist.

Frequently asked questions

How to buy Actinic Keratosis medications online?

You can buy your medications to treat Actinic Keratosis online at PocketPills if you already have a valid prescription from your doctor. You can get started by uploading your prescription, ordering a refill by transferring any existing medications to our pharmacy or talking to one of our Canadian Doctors to get an online prescription. Get started now!

Can I get brand name Actinic Keratosis medications or chose to get generics?

Absolutely. You can always communicate your preference for brand or generic medications during your online consultation. As a policy, PocketPills advocates generic medications as more affordable and more likely to be covered by your insurance plan

Can I get a prescription on PocketPills for Actinic Keratosis?

Yes, our physicians can prescribe medications online during your consultation. Once you receive a prescription, you'll have the option to have it delivered to your door in discreet packaging and at no additional cost!. Click here to get an online prescription today!


All material © 1996-2021 MediResource Inc. Terms and conditions of use. The contents herein are for informational purposes only. Always seek the advice of your physician or other qualified health providers with any questions you may have regarding a medical condition.

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