Actinic Keratosis: The Precancerous Spots Most People Ignore

A rough, sandpaper-like patch on your face, ears, or the back of your hands is one of the most commonly overlooked skin changes — mostly because it doesn't hurt, and it's easy to mistake for dry skin. That patch may actually be an actinic keratosis, and it's worth taking seriously: it's the most common precancerous skin lesion, and left untreated, a small percentage progress to skin cancer.

What Is an Actinic Keratosis?

An actinic keratosis (AK) is a rough, scaly patch of skin caused by cumulative UV damage, most often appearing on chronically sun-exposed areas — the face, ears, scalp (especially in balding men), neck, forearms, and the backs of the hands. They typically feel rougher than they look, often described as feeling like sandpaper before they're even visually obvious.

AKs form when years of UV exposure damage the DNA of skin cells in the outer layer of skin, causing abnormal cell growth. They're considered precancerous because a subset can progress into squamous cell carcinoma if left untreated.

What Does an Actinic Keratosis Look Like?

• A rough, dry, scaly patch, often pink, red, or skin-colored
• Usually small — often less than a quarter inch — though patches can merge into larger areas
• More easily felt than seen in early stages
• May come and go, or thicken and become more persistent over time
• Sometimes itchy or tender, though many cause no symptoms at all

Why Actinic Keratosis Matters

Most individual AKs will not turn into cancer. But because they represent significant cumulative sun damage, having one is a strong signal that more may be present or may develop, and a small but real percentage of untreated AKs progress to squamous cell carcinoma over time. Because there's no reliable way to predict which specific spot will progress, dermatology professionals generally recommend treating them rather than watching and waiting.

Who Gets Actinic Keratosis?

AKs are extremely common in adults with a history of significant sun exposure, particularly:

• Fair-skinned individuals
• Adults over 40 (though they can appear earlier with heavy sun exposure)
• People with a history of sunburns or indoor tanning
• Florida residents and others in high-UV climates, given the cumulative exposure of year-round sun

How Is Actinic Keratosis Treated?

Treatment depends on how many AKs are present and where:

• Cryotherapy — freezing individual spots with liquid nitrogen, one of the most common treatments for a small number of isolated AKs
• Topical medications — prescription creams applied over several weeks to treat AKs across a broader area, including ones too small or early to see
• Photodynamic therapy (PDT) — a light-activated treatment that targets damaged cells across a treatment area, useful when AKs are widespread
• Curettage — scraping off the lesion, sometimes combined with other techniques

Your dermatology professional will recommend a treatment based on how many spots you have, where they are, and how they look and feel on exam.

When to See a Dermatology Professional

Any new rough, scaly, persistent patch — especially on sun-exposed skin — is worth having evaluated, particularly if it doesn't resolve on its own within a few weeks, grows, thickens, becomes tender, or bleeds. Because AKs signal significant sun damage, having one is also a good reminder to schedule a full-body skin cancer screening if you haven't had one recently.

Sources: American Academy of Dermatology; Skin Cancer Foundation.