Actinic Keratosis (Solar Keratosis): Symptoms, Solar Damage & UK Management

Actinic keratosis, also frequently referred to as solar keratosis, is a common skin condition characterized by rough, scaly patches that develop on skin damaged by years of exposure to the sun. In the UK, it is most frequently seen in fair-skinned individuals over the age of 50, though it is increasingly common in younger adults who have spent significant time outdoors or used sunbeds.

According to NICE (National Institute for Health and Care Excellence), these lesions are considered 'pre-cancerous'. This does not mean they are currently cancer, but rather that they have the potential to develop into a type of skin cancer called squamous cell carcinoma (SCC) over many years if they are not monitored or treated. The risk of any single patch turning into cancer is very low, but because patients often have multiple patches (field change), management is important.

Actinic keratosis typically appears on 'sun-exposed' areas, such as the scalp (particularly in balding men), face, ears, neck, forearms, and the backs of the hands. The appearance can vary significantly between individuals.

Common signs include:

• Texture: A rough, sand-paper-like feel to the skin. Often, the patch is felt before it is easily seen.
• Appearance: Small, scaly patches that may be skin-coloured, red, pink, or brown.
• Size: Patches usually range from a few millimetres to two centimetres in diameter.
• Sensation: Some lesions may itch, sting, or feel tender, especially when exposed to the sun or touched.
• Crusting: A hard, wart-like surface may develop (known as a cutaneous horn).

It is important to note that these lesions can come and go. They may seem to disappear for a few weeks and then reappear in the same spot, often triggered by further sun exposure.

The primary cause of actinic keratosis is cumulative ultraviolet (UV) radiation. This damage builds up over decades, which explains why the condition is more prevalent in older populations. UV light damages the DNA of skin cells (keratinocytes), causing them to grow abnormally.

Key risk factors in the UK population include:

• Fair Skin (Fitzpatrick types I and II): Individuals who freckle or burn easily and have blue or green eyes.
• History of Sunburn: Frequent or severe blistering sunburns during childhood or adolescence.
• Outdoor Occupations: Farmers, builders, and gardeners are at significantly higher risk.
• Immunosuppression: People on long-term medication to suppress the immune system (e.g., after an organ transplant) are more likely to develop multiple lesions.
• Age: The risk increases as the skin loses its ability to repair UV damage over time.

In the UK, the choice of treatment depends on the number of lesions, their location, and whether ‘field change’ (an entire area of sun-damaged skin) is present. Most treatments are delivered via the NHS or private dermatology services.

Topical Creams (Field Treatments)

If you have multiple patches, a cream or gel is often prescribed to treat the entire area. Common treatments include:

• Fluorouracil (Efudix): A chemotherapy cream that targets abnormal cells. It often causes redness and crusting before the skin heals.
• Imiquimod (Aldara / Zyclara): A cream that stimulates the immune system to attack the abnormal cells.
• Diclofenac (Solaraze): A non-steroidal anti-inflammatory gel used for milder cases over a period of 60 to 90 days.
• Tirbanibulin (Klisyri): A newer, short-course treatment applied over five days.

Physical Removal (Lesion-Specific)

• Cryotherapy: Liquid nitrogen is used to freeze individual lesions. This is a very common GP-led treatment in the UK.
• Curettage: Scraping the lesion away under local anaesthetic.
• Photodynamic Therapy (PDT): A light-sensitising cream is applied, followed by exposure to a specific light source to kill the cells.

While many skin changes are benign, any new or changing patch of skin should be assessed by a healthcare professional. Speaking to an online doctor is a convenient first step for British patients concerned about sun damage.

An online GP consultation can help to:

• Identify whether a lesion is likely to be actinic keratosis or requires an urgent referral.
• Provide advice on suitable emollient use or initial topical treatments.
• Issue prescriptions for treatments like Solaraze or Klisyri where appropriate.
• Advise on the best ways to protect your skin from further damage.

During a video consultation, a GP can examine the lesion and determine if you need an in-person referral to a dermatologist for a biopsy or cryotherapy. This pathway ensures that potential skin cancers are caught early while providing peace of mind for benign conditions.

Once you have developed actinic keratoses, you are at a higher risk of developing more in the future. Prevention is the cornerstone of management. The British Association of Dermatologists recommends a 'sun-safe' approach:

• High SPF: Use a broad-spectrum sunscreen with an SPF of at least 30, even on cloudy UK days.
• Protective Clothing: Wear wide-brimmed hats and clothing that covers the arms and legs.
• Shade: Avoid the sun during peak intensity hours, typically between 11 am and 3 pm from March to October in the UK.
• Regular Checks: Perform a monthly skin self-examination to look for new or changing spots.