Actinic Keratosis: Causes, Symptoms, Diagnosis & Treatment

What is Actinic Keratosis?

Actinic Keratosis (AK), also known as solar keratosis, is a precancerous skin condition caused by prolonged sun exposure. It appears as rough, scaly patches on sun-exposed areas like the face, ears, hands, and scalp. If left untreated, AK can develop into squamous cell carcinoma (SCC), a type of skin cancer.

What Causes Actinic Keratosis?

The primary cause of actinic keratosis is long-term exposure to ultraviolet (UV) radiation from the sun or tanning beds. This exposure damages skin cells over time, leading to abnormal cell growth.

Risk Factors:

• Frequent sun exposure (outdoor workers, athletes, sunbathers)
• Fair skin, light hair, and blue or green eyes
• Weakened immune system (due to illness or medication)
• History of sunburns or excessive tanning
• Older age (over 40)
• Living in sunny or high-altitude regions

What Are the Symptoms of Actinic Keratosis?

Actinic keratosis usually develops gradually and can be hard to distinguish from dry skin or eczema.

Common Signs & Symptoms:

• Rough, scaly, or crusty patches on the skin
• Red, pink, or brownish discoloration
• Itchy, burning, or tender spots
• Flat or slightly raised lesions
• Dry, rough texture that doesn’t heal
• Multiple patches in the same area (field cancerization)

How is Actinic Keratosis Diagnosed?

A dermatologist can diagnose AK through a physical examination and, in some cases, a skin biopsy.

Diagnostic Methods:

1. Visual Inspection – Identifies scaly patches and sun damage
2. Dermoscopy – Uses a magnified light to examine lesions
3. Skin Biopsy (if needed) – Confirms whether the lesion is precancerous or cancerous

What Are the Treatment Options for Actinic Keratosis?

Early treatment is essential to prevent progression to skin cancer.

1. Topical Medications (For Multiple Lesions)

• 5-Fluorouracil (5-FU) – A chemotherapy cream that destroys abnormal cells
• Imiquimod (Aldara, Zyclara) – Stimulates the immune system to attack precancerous cells
• Diclofenac (Solaraze) – A non-steroidal anti-inflammatory gel used for mild cases
• Ingenol Mebutate (Picato) – A gel that triggers cell death in AK lesions

2. Cryotherapy (Freezing the Lesion)

• Liquid nitrogen is applied to freeze and destroy the AK lesion
• Quick procedure with minimal downtime
• Temporary redness, blistering, or peeling may occur

3. Photodynamic Therapy (PDT)

• A light-sensitive drug (aminolevulinic acid) is applied to the skin
• Exposed to a special blue or red light to destroy AK cells
• Effective for treating multiple lesions at once

4. Laser Therapy & Chemical Peels

• Laser treatment or chemical peels remove sun-damaged skin layers
• Best for widespread or stubborn AK lesions

5. Surgical Removal (For High-Risk Lesions)

• Curettage (Scraping) and Electrocautery – Removes thicker AK spots
• Excisional Surgery – Removes suspicious lesions to check for skin cancer

Can Actinic Keratosis Be Prevented?

Yes, prevention focuses on protecting the skin from UV damage.

Sun Protection Tips:

• Wear sunscreen (SPF 30+), even on cloudy days
• Avoid prolonged sun exposure, especially between 10 AM – 4 PM
• Wear protective clothing, hats, and sunglasses
• Avoid tanning beds
• Regular skin checks for early detection

Can Actinic Keratosis Turn Into Skin Cancer?

Yes, untreated AK lesions can develop into squamous cell carcinoma (SCC), a type of skin cancer. Early treatment reduces this risk significantly.