What Is Actinic Keratosis and Can It Turn Into Skin Cancer?

Although actinic keratosis is not skin cancer, it is considered a precancerous condition. This means there is a risk that some lesions may eventually develop into a type of skin cancer known as squamous cell carcinoma (SCC).

Having a basic understanding of what actinic keratosis is, why it develops, and when it may require further attention can help people make informed decisions about protecting their skin and seeking appropriate medical advice.

Understanding actinic keratosis

Actinic keratosis, sometimes called solar keratosis, develops when UV radiation damages skin cells over many years. The condition is most commonly seen in people over the age of 40, although it can occur earlier in individuals with significant sun exposure.

These lesions often appear on areas of the body that receive regular sunlight, including:

• The face
• Scalp
• Ears
• Neck
• Forearms
• Hands

Actinic keratoses may look different from person to person. Some appear as small rough patches that are easier to feel than see, while others become thicker, redder, or more noticeable over time.

Many people develop multiple lesions, particularly if they have spent many years working outdoors or enjoying outdoor activities without consistent sun protection.

Why actinic keratosis develops

The primary cause of actinic keratosis is cumulative exposure to ultraviolet radiation from the sun.

Over time, UV radiation can damage the DNA within skin cells. While the body can repair some of this damage, repeated exposure may eventually lead to abnormal cell growth and the development of actinic keratoses.

Several factors can increase the likelihood of developing the condition, including:

• Fair skin that burns easily
• A history of frequent sunburn
• Long-term outdoor work or recreation
• Increasing age
• Use of sunbeds
• A weakened immune system

Actinic keratosis is often considered a visible sign of chronic sun damage. Its presence can indicate that the surrounding skin has also been exposed to significant ultraviolet radiation over many years.

Actinic Keratosis and the Risk of Skin Cancer

One of the most important questions people have about actinic keratosis is whether it can develop into skin cancer. The answer is yes, as some cases of actinic keratosis can progress to skin cancer.

The main concern is the development of squamous cell carcinoma, a common form of non-melanoma skin cancer. While not every actinic keratosis will become cancerous, it is difficult to predict which lesions may progress and which may remain stable.

For this reason, healthcare professionals generally recommend monitoring and, where appropriate, treating actinic keratoses rather than simply ignoring them.

The risk associated with an individual lesion is relatively low, but the risk increases when a person has multiple lesions or extensive sun-damaged skin.

Actinic keratosis can therefore be viewed as both a precancerous condition and a marker of increased skin cancer risk. This is one reason why ongoing skin awareness and regular assessment of changing lesions remain important, as early diagnosis can help ensure that an appropriate skin cancer treatment plan is established if cancer has developed.

Signs that may require further assessment

Many actinic keratoses remain stable for long periods. However, certain changes may warrant further medical evaluation.

Features that should not be ignored include:

• Rapid growth
• Thickening of the lesion
• Persistent tenderness or pain
• Bleeding
• Ulceration
• Significant changes in appearance

These changes do not automatically mean that skin cancer has developed. However, they may indicate that further examination is required to determine whether additional investigation is needed and what treatment options may be appropriate.

People with multiple actinic keratoses should also remain aware of other skin changes that develop elsewhere on the body, as significant sun damage can increase the risk of several different forms of skin cancer.

How actinic keratosis is treated

Treatment depends on factors such as the number of lesions present, their location, and the overall extent of sun damage.

Common treatments may include:

• Cryotherapy (freezing the lesion)
• Prescription creams
• Light-based therapies
• Curettage or minor surgical procedures in selected cases

The goal of treatment is to remove abnormal cells before they have the opportunity to progress further.

In addition to treating visible lesions, many treatment approaches also aim to address areas of surrounding sun-damaged skin where abnormal changes may already be developing.

The most appropriate management strategy should be determined by the healthcare professional responsible for assessing the condition.

Protecting your skin and reducing future risk

Although previous sun damage cannot be reversed completely, steps can be taken to reduce further damage and lower the risk of developing additional lesions.

These measures include:

• Using broad-spectrum sunscreen regularly
• Wearing protective clothing
• Seeking shade during periods of strong sunlight
• Avoiding sunbeds
• Performing regular skin self-checks

Early recognition of new or changing skin lesions can make a significant difference when it comes to diagnosis and treatment.

Actinic keratosis serves as an important reminder that long-term sun exposure can have lasting effects on skin health, even many years after the exposure occurred. While no preventative measure can eliminate risk entirely, sun protection and regular skin awareness remain important ways to help prevent skin cancer and detect concerning changes at an earlier stage.

When specialist advice may be appropriate

Most cases of actinic keratosis are managed within dermatology services. However, if skin cancer develops, treatment discussions may become more complex depending on the type of cancer involved and the treatments being considered.

Patients diagnosed with melanoma or other forms of skin cancer may benefit from speaking with a skin cancer specialist to better understand their diagnosis, treatment recommendations, and the factors that may influence their prognosis.

Understanding the available options can help patients feel more informed and more confident when making decisions about their care.

About Dr James Wilson

Questions about actinic keratosis often lead to wider discussions about skin cancer risk, diagnosis, and treatment. While actinic keratosis itself is not skin cancer, understanding when further assessment may be needed is an important part of protecting long-term skin health.

Dr James Wilson is a consultant clinical oncologist in private practice in London with expertise in melanoma and skin cancer treatment. He helps patients understand complex treatment options and provides personalised guidance tailored to their individual circumstances.