Actinic Keratosis

Precancerous sun-damaged skin lesions

Medically reviewed by Dr. Steven Q. Wang, MDLast reviewed

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What is Actinic Keratosis?

Actinic keratosis (AK), also called solar keratosis, is a rough, scaly patch on the skin that develops from years of sun exposure. It's considered precancerous because it can potentially develop into squamous cell carcinoma if left untreated. AKs are most common in fair-skinned people and typically appear on sun-exposed areas like the face, scalp, ears, neck, forearms, and hands.

While most actinic keratoses don't progress to cancer, early treatment is important to prevent potential transformation and address cosmetic concerns.

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Key Topics

Explore these essential topics to better understand your actinic keratosis diagnosis and management:

What is an actinic keratosis and how is it different from skin cancer?
Understanding the precancerous nature of AKs and their relationship to cancer
How do I know whether an AK needs treatment now or can be watched safely?
When to treat versus monitor, and what factors influence the decision
What are the treatment options for actinic keratoses and how do I pick the right one?
Comparing freezing, topical treatments, and other options for your situation
What are the risks of leaving AK untreated — can it turn into skin cancer?
Understanding progression rates and why early treatment matters
How often should I get skin exams when I have AKs?
Recommended monitoring schedules and when to see your dermatologist
What skin-care and sun-protection habits help reduce new AKs?
Daily prevention strategies and lifestyle changes to protect your skin
What do I do when I have many AKs — does the approach differ?
Field therapy options for widespread sun damage and multiple lesions
How do I talk to my doctor about managing AKs over time and monitoring changes?
Questions to ask and how to advocate for effective long-term care
What is photodynamic therapy (PDT), and is it right for me?
A light-activated field treatment for AKs — mechanism, what to expect, and aftercare

Warning Signs & Appearance

Texture

Rough, dry, or scaly patches that feel like sandpaper to the touch

Color

Usually pink, red, or brown; may match your skin tone or appear slightly darker

Size

Typically small (less than 1 inch), but can vary in size and may cluster together

Sensation

May be tender, itchy, or cause a burning sensation; sometimes easier to feel than see

Location

Most common on sun-exposed areas: face, lips, ears, scalp (especially in bald areas), neck, forearms, and backs of hands

Risk Factors

  • •Fair skin, light hair, and light-colored eyes
  • •History of frequent or intense sun exposure
  • •Age over 40 (risk increases with age)
  • •History of sunburns, especially blistering burns
  • •Weakened immune system
  • •Living in sunny climates or high altitudes
  • •Occupations with outdoor work exposure

Prevention

  • •Apply broad-spectrum SPF 30+ sunscreen daily, even on cloudy days
  • •Reapply sunscreen every 2 hours when outdoors
  • •Seek shade during peak sun hours (10am-4pm)
  • •Wear protective clothing, wide-brimmed hats, and UV-blocking sunglasses
  • •Avoid tanning beds and intentional sun tanning
  • •Consider taking nicotinamide (vitamin B3) supplements
  • •Schedule regular skin examinations with a dermatologist

Treatment Options

Treatment depends on the number, size, and location of actinic keratoses. Your dermatologist may recommend one or more of the following:

  • •Cryotherapy (freezing): Liquid nitrogen is applied to freeze and destroy the abnormal cells; most common treatment for single lesions
  • •Topical medications: Prescription creams or gels (like 5-fluorouracil, imiquimod, or diclofenac) applied at home for field treatment
  • •Photodynamic therapy (PDT): Light-activated treatment that targets multiple AKs at once using a photosensitizing agent and special light
  • •Chemical peels: Application of a chemical solution to remove damaged outer layers of skin
  • •Curettage: Scraping off the AK with a special instrument; may be combined with electrodesiccation
  • •Laser therapy: Using targeted laser energy to remove lesions with minimal scarring

Field Cancerization

When you have actinic keratoses, the surrounding skin has often been damaged by years of sun exposure as well. This condition, called "field cancerization," means that while you may only see a few rough spots, there may be many more precancerous cells in the area that aren't yet visible.

This is why dermatologists often recommend "field therapy" treatments (like topical medications or PDT) that treat larger areas of sun-damaged skin, not just individual spots. These treatments can help prevent new AKs from forming and reduce your risk of developing skin cancer.

Printable Discussion Guide

Every question from the topics above, collected into one printable checklist — with a checkbox and space for notes beside each, and header fields for your appointment date and doctor's name.

Download the complete actinic keratosis discussion guide (PDF)

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