An actinic keratosis (ak-TIN-ik ker-uh-TOE-sis) is a rough, scaly patch on your skin that develops from years of exposure to the sun. It's most commonly found on your face, lips, ears, back of your hands, forearms, scalp or neck.
Also known as a solar keratosis, an actinic keratosis enlarges slowly and usually causes no signs or symptoms other than a patch or small spot on your skin. These patches take years to develop, usually first appearing in people over 40.
A small percentage of actinic keratosis lesions can eventually become skin cancer. You can reduce your risk of actinic keratoses by minimizing your sun exposure and protecting your skin from ultraviolet (UV) rays.
The signs and symptoms of an actinic keratosis include:
- Rough, dry or scaly patch of skin, usually less than 1 inch (2.5 centimeters) in diameter
- Flat to slightly raised patch or bump on the top layer of skin
- In some cases, a hard, wartlike surface
- Color as varied as pink, red or brown
- Itching or burning in the affected area
Actinic keratoses are found primarily on areas exposed to the sun, such as your face, lips, ears, hands, forearms, scalp and neck.
When to see a doctor
It can be difficult to distinguish between noncancerous spots and cancerous ones. So it's best to have new skin changes evaluated by a doctor — especially if a spot or lesion persists, grows or bleeds.
An actinic keratosis is caused by frequent or intense exposure to UV rays, from the sun or from tanning beds.
Anyone can develop actinic keratoses. But you may be more likely to develop the condition if you:
- Are older than 40
- Live in a sunny climate
- Have a history of frequent or intense sun exposure or sunburn
- Have red or blond hair, and blue or light-colored eyes
- Tend to freckle or burn when exposed to sunlight
- Have a personal history of an actinic keratosis or skin cancer
- Have a weak immune system as a result of chemotherapy, leukemia, AIDS or organ transplant medications
If treated early, almost all actinic keratoses can be cleared up or removed before they develop into skin cancer. If left untreated, some of these spots may progress to squamous cell carcinoma — a type of cancer that usually isn't life-threatening if detected and treated early.
Prevention of actinic keratoses is important because the condition can precede cancer or be an early form of skin cancer. Sun safety is necessary to help prevent development and recurrence of actinic keratosis patches and spots.
Take these steps to protect your skin from the sun:
- Limit your time in the sun. Especially avoid time in the sun between 10 a.m. and 2 p.m. And avoid staying in the sun so long that you get a sunburn or a suntan. Both result in skin damage that can increase your risk of developing actinic keratoses and skin cancer. Sun exposure accumulated over time may also cause actinic keratoses.
Use sunscreen. Daily use of sunscreen reduces the development of actinic keratoses. Before spending time outdoors, apply a broad-spectrum sunscreen with a sun protection factor (SPF) of at least 15. The American Academy of Dermatology recommends using a broad-spectrum, water-resistant sunscreen with an SPF of at least 30.
Use sunscreen on all exposed skin, and use lip balm with sunscreen on your lips. Apply sunscreen 15 minutes before sun exposure and reapply it every two hours or more often if you swim or sweat.
- Cover up. For extra protection from the sun, wear tightly woven clothing that covers your arms and legs. Also wear a broad-brimmed hat, which provides more protection than does a baseball cap or golf visor. You might also consider wearing clothing or outdoor gear specially designed to provide sun protection.
- Avoid tanning beds. The UV exposure from a tanning bed causes just as much skin damage as a tan acquired from the sun. And because the radiation of a tanning bed is absorbed in a short time, the photoaging process is accelerated and increases your risk of skin cancer.
- Check your skin regularly and report changes to your doctor. Examine your skin regularly, looking for the development of new skin growths or changes in existing moles, freckles, bumps and birthmarks. With the help of mirrors, check your face, neck, ears and scalp. Examine the tops and undersides of your arms and hands.