Actinic keratosis, also known as solar keratosis, is a common precancerous skin condition caused by long-term or repeated exposure to ultraviolet (UV) radiation from sunlight or artificial sources such as tanning beds. It appears as a rough, scaly, or crusty patch on areas of skin that receive frequent sun exposure. Most actinic keratoses remain harmless, but some can develop into squamous cell carcinoma (SCC), a type of skin cancer. For this reason, suspicious or persistent skin changes should be examined by a dermatologist.
When actinic keratosis affects the lips, particularly the lower lip, it is called actinic cheilitis. It may cause persistent dryness, scaling, cracking, or loss of the normal border between the lip and surrounding skin. Because actinic cheilitis can be associated with an increased risk of squamous cell carcinoma, it should be evaluated by a healthcare professional.
The main cause of actinic keratosis is long-term damage from ultraviolet (UV) radiation. UV radiation can damage the DNA of skin cells. Over many years, repeated exposure can cause abnormal changes in these cells, resulting in actinic keratoses. Common sources of UV exposure include:
Frequent exposure to direct sunlight
Prolonged outdoor activities
Repeated sunburns
Living in areas with strong sunlight
Use of tanning beds or sunlamps
Actinic keratosis is generally the result of cumulative sun damage, so a lesion may appear years after the original UV exposure occurred.
The most important concern with actinic keratosis is its potential to progress to squamous cell carcinoma (SCC). Not every actinic keratosis becomes cancerous, and it is difficult to predict which individual lesion will progress. However, lesions that become thicker, painful, rapidly growing, bleeding, or ulcerated may require prompt medical assessment. Having multiple actinic keratoses also indicates significant cumulative UV damage and may be associated with an increased risk of developing skin cancer.
A dermatologist can often diagnose actinic keratosis by examining the skin. The doctor may use a special magnifying device called a dermatoscope to examine the lesion more closely. If the appearance is unusual or there is concern that the lesion may have developed into skin cancer, a skin biopsy may be performed. During a biopsy, a small sample of the affected skin is removed and examined under a microscope.
Treatment depends on the number, size, location, thickness, and appearance of the lesions, as well as the patient’s overall health and risk factors. Common treatment options include:
Certain medicines can be applied directly to affected areas. Depending on the medication, treatment may stimulate the immune system, destroy abnormal cells, or cause damaged cells to be removed. Examples include 5-fluorouracil, imiquimod, diclofenac, and tirbanibulin. The appropriate treatment should be selected and prescribed by a healthcare professional.
In photodynamic therapy, a light-sensitive medication is applied to the affected skin and then activated with a specific type of light. This treatment can be useful when multiple lesions are present.
A dermatologist may scrape away the abnormal tissue using a procedure called curettage. In some cases, an electrical current is also used to destroy remaining abnormal cells.
Certain laser treatments may be used to remove or treat actinic keratoses, particularly in selected cases. Treatment does not eliminate the underlying sun damage, so new actinic keratoses can develop later.
Some actinic keratoses may temporarily disappear, but they can return, and the underlying sun damage remains. Because some lesions can progress to squamous cell carcinoma, persistent or suspicious lesions should be evaluated by a dermatologist rather than relying on them to disappear without treatment.
Actinic keratosis is not skin cancer, but it is considered a precancerous or potentially precancerous lesion. A small proportion of actinic keratoses may progress to squamous cell carcinoma. Early evaluation and appropriate treatment can help reduce the risk of progression and identify lesions that may already have undergone cancerous changes.
Actinic keratosis is usually not immediately dangerous, but some lesions can progress to squamous cell carcinoma. Medical evaluation is therefore recommended, particularly for lesions that change or become symptomatic.
Actinic keratosis does not spread from one person to another because it is not an infectious disease. However, people with significant sun damage may develop multiple lesions in different areas of the skin.
Sun protection can significantly reduce additional UV-related skin damage and may help prevent new actinic keratoses. Regular skin examinations can also help identify suspicious lesions early.
Yes. Some actinic keratoses can progress to squamous cell carcinoma. A dermatologist can determine whether a lesion needs treatment or further investigation.
Medical Disclaimer:This article is intended for general educational and informational purposes only. It does not replace professional medical advice, diagnosis, or treatment. If you have a new, persistent, changing, bleeding, painful, or suspicious skin lesion, consult a qualified healthcare professional, preferably a dermatologist.
