Home - Dermatology Atlas: Skin Disease Directory, Photos & Treatment Guide - 2. Precancerous Skin Lesions & Premalignant Growths (2) - Actinic Keratosis: Symptoms, Photos, and AI Analysis ⚠️ ICD-10: L57 | ICD-11: EK90

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Actinic keratosis is a skin change caused by long-term exposure to sunlight. It usually appears as a dry, rough, reddish patch or area of skin and most commonly develops after the age of 40 on parts of the body that receive frequent sun exposure.

The condition is not contagious, but it is considered precancerous, meaning that in some cases it may gradually develop into skin cancer.

These lesions most often appear on the face, ears, scalp, and hands — areas that are regularly exposed to sunlight.

What to Do If You Suspect Actinic Keratosis

If you notice a rough area of skin that does not go away and gradually changes over time, it is important to consult a dermatologist.

The doctor will examine your skin and, if necessary, perform dermoscopy — an examination using magnification to assess the structure of the lesion. In some cases, a biopsy may be required to rule out malignant changes.

These skin changes should not be ignored, even if they are not painful. Actinic keratosis can progress, so early diagnosis can help reduce potential risks.

It is also important not to self-treat or damage the affected area.

What Actinic Keratosis Looks Like

Actinic keratosis usually appears as patches or areas of skin with a rough surface.

Typical features include:

dry, rough texture
scaling or crusting
irregular, poorly defined borders
color ranging from skin-colored or gray to pink or reddish

Sometimes these lesions are easier to feel than to see — the skin may have a characteristic “sandpaper-like” texture.

Lesions are usually a few millimeters to 1–2 cm in size, although larger areas may develop when several lesions merge.

The most commonly affected areas include:

face (nose, forehead, cheeks)
ears
scalp
hands and shoulders

The number of lesions may increase over time.

Further down in this article, you can see real photos to better understand what actinic keratosis may look like.

Main Symptoms

Actinic keratosis often develops without obvious symptoms.

Possible symptoms include:

rough skin texture
mild itching
dryness
occasional pain or bleeding if the area is injured

The main characteristic is a persistent change in an area of skin.

Causes

The main cause of actinic keratosis is prolonged exposure to ultraviolet (UV) radiation.

Skin damage accumulates over many years, which means actinic keratosis may appear long after periods of intense sun exposure.

Risk Factors

External factors:

frequent and prolonged sun exposure

Internal factors:

fair skin
age over 50
weakened immune system
genetic predisposition

Chemical exposure and chronic skin trauma may also contribute.

How Actinic Keratosis Develops

UV radiation gradually damages skin cells called keratinocytes.

Over time, some of these cells begin to divide abnormally, leading to the formation of thickened, keratinized areas of skin.

This is not yet skin cancer, but the cells have undergone abnormal changes and require monitoring and, in many cases, treatment.

Forms and Types

Actinic keratosis can appear in different forms, ranging from subtle rough areas to thick plaques with significant keratin buildup.

Individual lesions may merge and form larger affected areas.

When to See a Doctor

You should consult a doctor if:

an area does not disappear over time
it increases in size
its color or texture changes
bleeding or pain develops
a thick crust forms

Regular skin checks are also important if you already have actinic keratoses.

Treatment

Actinic keratosis generally requires treatment because of its potential to develop into skin cancer.

The main approaches include:

sun protection (protective clothing, hats, and sunscreen)
removal of lesions (cryotherapy, laser treatment, and other methods)
topical medications prescribed by a doctor

In some cases, surgical excision may be necessary, particularly when the diagnosis is uncertain.

Treatment is always individualized and should be supervised by a healthcare professional.

Track Your UV Exposure and Protect Your Skin

Frequent and cumulative exposure to ultraviolet radiation is closely associated with the development of actinic keratosis, particularly on areas of skin that have been exposed to the sun over many years. With the Skinive UV Index App, you can check current UV levels and forecasts and use information such as your skin phototype and SPF to better understand your sun exposure.

The app can help improve UV awareness, but it does not diagnose, treat, or monitor the progression of actinic keratosis. Any new or changing skin lesion should be evaluated by a healthcare professional.

UV-Exposition im Alltag im Blick behalten

Langfristige und wiederholte UV-Exposition ist ein wichtiger Faktor bei der Entstehung aktinischer Keratosen. Mit der Skinive UV Index App⁠ kannst du den aktuellen UV Index und die Vorhersage verfolgen und Informationen wie deinen Hauttyp und LSF/SPF nutzen, um deine Sonnenexposition bewusster im Blick zu behalten. Die App kann die Aufmerksamkeit für UV-Belastung und Sonnenschutz unterstützen, diagnostiziert oder behandelt jedoch keine aktinische Keratose. Neue, auffällige oder sich verändernde Hautstellen sollten dermatologisch beurteilt werden.

Q&A

Is actinic keratosis dangerous?

It is a precancerous condition that can sometimes develop into skin cancer, so appropriate monitoring and treatment are important.

Can actinic keratosis be cured?

Yes. Lesions can be removed or managed with appropriate treatment.

Does actinic keratosis need to be treated?

In most cases, yes, to reduce the risk of malignant transformation.

Can actinic keratosis go away on its own?

Some lesions may regress, but many persist or progress.

Is actinic keratosis skin cancer?

No. However, it can develop into skin cancer if it progresses.

Can I still go out in the sun?

Limiting UV exposure and using appropriate sun protection are important because further sun exposure can contribute to additional skin damage.

Why does actinic keratosis appear years later?

Because UV-related skin damage accumulates gradually over time.

Can actinic keratosis be prevented?

Consistent sun protection can significantly reduce the risk.

Check Your Skin Instantly

Use the Skin cancer detector: Skinive AI to take a photo of a mole or lesion and get an AI-based risk assessment. It helps determine whether professional consultation is recommended, giving you fast guidance and peace of mind.