Actinic Keratosis vs. Sunburn: How to Know the Difference

That red, flaky patch on your skin might not be just another sunburn. While sunburn fades within days, some skin changes linger—and that could mean something more serious. Understanding the difference between sunburn and actinic keratosis (AK) is essential for early detection and peace of mind.

At Harris Dermatology in Naples and Fort Myers, patients benefit from the experience of Dr. Brian Harris and Dr. H. Ross Harris—board-certified dermatologists trained at the Mayo Clinic and the University of Miami. Their expertise in identifying and treating precancerous skin conditions ensures accurate diagnoses and trustworthy care. 

What Is Actinic Keratosis?

Actinic keratosis is a rough, scaly patch on the skin that forms from years of sun exposure. These lesions are considered precancerous and can potentially develop into squamous cell carcinoma if untreated. They commonly appear on the face, scalp, neck, and hands—areas that receive the most sun.

While they may resemble dry skin or sunburn, actinic keratoses are persistent and usually feel like sandpaper. According to the Skin Cancer Foundation, approximately 58 million Americans have at least one actinic keratosis.

How Is It Different from a Sunburn?

Sunburn is an inflammatory reaction to ultraviolet (UV) rays that damages the skin’s outer layer. It causes redness, pain, and sometimes peeling. Unlike actinic keratosis, sunburn typically heals within a week. Here are some key differences to watch for:

• Duration: Sunburn clears within days; actinic keratoses persist for weeks or months.
• Texture: Sunburned skin feels smooth and warm; AK feels rough or crusty.
• Location: AK typically occurs on chronically sun-exposed areas; sunburn can affect larger surface areas.
• Symptoms: AK may itch or sting slightly; sunburn is often painful to the touch.

If you notice a spot that won’t go away or seems to worsen, it’s time to see a dermatologist.

Why Early Diagnosis Matters

Identifying actinic keratosis early helps prevent its progression into skin cancer. Since these lesions form gradually, they often go unnoticed or are mistaken for other skin issues. That’s why professional skin exams are so important—especially if you spend a lot of time outdoors or have a history of sunburn.

Early detection allows simple treatments such as cryotherapy or photodynamic therapy (PDT), which eliminate abnormal cells with minimal recovery time.

Book Your Skin Check with Harris Dermatology

Concerned about a lingering skin patch or frequent sunburns? Schedule your skin exam with Harris Dermatology today. Our Naples and Fort Myers locations provide expert care for early detection and treatment of actinic keratosis and other sun-related skin issues. Call 239-596-1848 (Naples) or 239-936-3344 (Fort Myers) to book an appointment.