What Is Actinic Keratosis?
Actinic keratosis is caused by UV rays from the sun or tanning beds. The condition may morph into invasive squamous cell skin cancer.
Actinic keratosis (also called solar keratosis) is a skin condition characterized by scaly, rough, bumpy spots on the skin. It can progress to invasive squamous cell carcinoma, a type of skin cancer. Actinic keratosis is caused by ultraviolet (UV) light.
What Are Symptoms of Actinic Keratosis?
Symptoms of actinic keratoses include:
- Skin lesions
- Lesions usually occur in areas of long-term sun exposure, such as the face, ears, forearms, hands, and in bald men, the scalp
- Lesions start as small, rough spots that have a “sandpaper-like” texture
- Over time lesions get bigger, and become red and scaly
- Most lesions measure about 3-10 mm, but they may grow to several centimeters in size
- Multiple lesions may occur in a single area, and these areas may collide and cover a larger area
- Other characteristics of the lesions may include:
What Causes Actinic Keratosis?
Actinic keratoses are caused by ultraviolet (UV) light, a component of sunlight and artificial light sources like tanning beds.
Risk factors for developing actinic keratoses include:
- Fair skin that burns easily
- Skin that doesn’t tan easily
- Redheaded or blond hair color
- Blue or light-colored eyes
- Increased sun exposure
- Higher intensity sun exposure
- Living in a sunny area
- Immunosuppression following organ transplantation, chemotherapy, AIDS, or leukemia
- Human papillomavirus
- Age over 40
- A personal history of an actinic keratosis or skin cancer
How Is Actinic Keratosis Diagnosed?
Another diagnostic tool for actinic keratosis is fluorescence with the use of a photosensitizing drug (methyl ester of 5-aminolevulinic acid [ALA], a precursor of protoporphyrin) commonly used during photodynamic therapy (PDT).
What Is the Treatment for Actinic Keratosis?
Treatment of actinic keratosis includes:
- Photodynamic therapy (PDT)
- Aminolevulinic acid (Levulan Kerastick, Ameluz)
- Curettage, shave excision, and conventional excision (used for lesions that may indicate invasive cancer)
- Cosmetic resurfacing procedures
- Medium and deep chemical peels
- Ablative laser resurfacing
One study suggested that a low-fat diet may also lead to increased healing of existing actinic keratoses and decreased development of new ones.
What Are Complications of Actinic Keratosis?
The main complication of actinic keratosis is that lesions may progress into invasive squamous cell cancer.
How Do You Prevent Actinic Keratosis?
Actinic keratosis lesions are caused by ultraviolet (UV) exposure, so protecting the skin from the sun’s UV rays can help prevent the development of lesions.