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Actinic Keratosis

Actinic keratoses are rough, scaly patches caused by years of sun damage. A small percentage can progress to squamous cell skin cancer, so evaluation and treatment matter.

Dermatologic
An actinic keratosis (AK) is a rough, scaly patch that develops on skin damaged by years of ultraviolet (UV) exposure. AKs are considered precancers: most remain harmless, but a small percentage progress over time to squamous cell carcinoma, a common form of skin cancer. Because there is no way to predict which spots will progress, evaluating and treating them is standard care — particularly for longtime Florida residents whose skin has seen decades of strong sun. AKs are extremely common: most fair-skinned adults who spend their lives in sunny climates will develop at least one by later adulthood. Causes and Risk Factors: Actinic keratoses are the direct result of cumulative UV damage to the outer layer of skin. They are most likely in people with:
  • Years of sun exposure: Outdoor work, boating, golf, and everyday errands in a sunny climate all contribute; tanning beds add further damage.
  • Fair skin that burns easily: Light skin, blond or red hair, and blue or green eyes carry the highest risk.
  • Older age: AKs typically appear after 40 and become very common in later decades as damage accumulates.
  • A weakened immune system: Transplant medications and some blood disorders let sun-damaged cells grow unchecked, increasing both AKs and skin cancers.
Symptoms: AKs favor the sun-exposed areas: the face, ears, scalp (especially with thinning hair), forearms, and backs of the hands. Typical features include:
  • A rough, sandpaper-like patch: Often easier to feel than to see, usually less than a quarter-inch across.
  • Pink, red, or brown color with dry scale: The scale may flake off and re-form repeatedly in the same spot.
  • Itching, burning, or tenderness: Some AKs are irritated by sun, sweat, or shaving.
  • A persistent or thickening spot: Unlike patches of dermatitis or facial redness from rosacea, an AK stays fixed in one place and does not clear with moisturizers.
  • Lip involvement (actinic cheilitis): Persistent dryness, scaling, and blurring of the lower lip border is a related form of sun damage that deserves evaluation.
Diagnosis: Clinicians usually recognize actinic keratoses by their look and feel during a skin examination. A spot that is unusually thick, tender, growing, or bleeding may be biopsied to make sure it has not already become a squamous cell carcinoma. Because sun damage affects whole regions of skin rather than single spots, the examination usually covers the entire face, scalp, ears, arms, and hands to find additional lesions. Treatment: Treatment removes damaged cells before they can progress. Options depend on how many spots are present:
  • Cryotherapy: Freezing individual spots with liquid nitrogen is quick and effective; the spot scabs and falls away over a week or two.
  • Field treatments: Prescription creams such as 5-fluorouracil or imiquimod treat whole areas of sun damage, clearing visible and invisible AKs together.
  • Photodynamic therapy: A light-activated medication destroys precancerous cells across a broad area, useful for the scalp and face.
  • Ongoing prevention: Daily sunscreen, hats, and sun-protective clothing prevent new AKs and lower future skin cancer risk.
Complications: The main concern is progression to squamous cell carcinoma. Warning signs that an AK may be transforming include rapid growth, thickening, pain, ulceration, or bleeding — changes like these should be evaluated promptly rather than watched. Once you have had one actinic keratosis, more are likely, so periodic skin checks become part of good preventive care. The primary-care team at Zimmer Medical Group can examine suspicious rough spots, treat or refer as needed, and build skin surveillance into your annual visit — schedule an appointment to have your skin checked.

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