Actinic Cheilitis: An Overview

Introduction

Actinic cheilitis (AC), sometimes known as "sailor's lip," is a lip ailment that may progress to squamous cell carcinoma (SCC), a kind of skin cancer. Like sunspots, it is induced by prolonged sun exposure. Near the red border, on the lower lip, actinic cheilitis frequently manifests. An 11 percent likelihood of spreading to other regions of the body makes squamous cell carcinoma (SCC) on the lips a dangerous kind of skin cancer. It is imperative to recognize and address these early warning indicators to stop cancer from developing.

What Is the Etiology of Actinic Cheilitis?

Actinic cheilitis is a lip ailment brought on by exposure to excessive UV (ultra-violet) radiation or sun. Individuals who are older than sixty, have fair skin, have certain hereditary disorders, or spend a lot of time outside at work are more vulnerable. Whether alcohol and smoking alone increase the risk of this occurring is a matter of debate.

What Is the Epidemiology of Actinic Cheilitis?

People with fair skin and those who live closer to the equator and get greater sun exposure are more likely to develop actinic cheilitis. Men are more affected than women because they spend more time in the sun and wear less lip protection. Actinic cheilitis's exact prevalence is unknown, however, approximately 3500 new instances of lip cancer, mostly squamous cell carcinoma (SCC) are recorded each year in the US (United States). It has been discovered that approximately 31.3 percent of adults over 45 in northwest Spain suffer from actinic cheilitis.

What Is the Pathophysiology of Actinic Cheilitis?

As one has less melanin, people with pale skin have less natural defense against UV radiation. Because the lips are a transitional area between the inside of the mouth and the exterior skin, they have physical properties that make them less UV radiation-resistant. Prolonged exposure to UV radiation can harm the p53 gene (a tumor suppressor gene), which can cause defective cells to proliferate uncontrollably. Actinic cheilitis and actinic keratoses frequently develop into SCC, a kind of skin cancer, due to a gene mutation. Because it receives more sunlight, the lower lip is especially susceptible to sun damage and has a higher chance of developing skin cancer.

What Is the Histopathology of Actinic Cheilitis?

The physician may suggest a biopsy with H&E staining (hematoxylin and eosin stain) if one has a suspicious lesion on the lip that does not go away to rule out aggressive skin cancer. Actinic cheilitis's basic histopathology, or tissue examination, entails searching for the following modifications:

1. Hyperkeratosis: The outer layer of skin thickens.

2. Solar Elastosis: A loss of a particular sort of staining and changes in elastic fibers that cause them to become twisted and uneven.

3. Mild to Moderate Epithelial Dysplasia: Unusual alterations in the skin cells' development, such as the loss of specific structures and varied degrees of abnormalities.

4. Perivascular Inflammation: Blood vessels surrounding inflammatory cells.

5. Severe Dysplasia: More profound cellular abnormalities, such as elevated abnormal keratinization, keratin pearl production, drop-shaped projections, and notable modifications to cell nuclei. These alterations indicate a higher likelihood of malignant transformation.

What Is the History and Physical Examination of Actinic Cheilitis?

History and physical examination may include:

• Appearance: Rugged, white patch on lips that persists.

• Common Location: Usually on the lip below the mouth.

• Boundary Blur: The blurring of the lips and skin's boundaries.

• Symptoms: Usually not painful, but can experience numbness, burning, or soreness.

• Progression: The patch may get scaly, and rough, and may develop sores over time.

• Affected Individuals: Fair-skinned people with Fitzpatrick I and II skin types and outdoor laborers (farmers, sailors, construction workers, lifeguards) are more likely to be affected.

What Is the Diagnosis of Actinic Cheilitis?

Examining the lips and analyzing tissue samples are used to diagnose actinic cheilitis. It is critical to distinguish between cancer, premalignant actinic cheilitis, and benign inflammation (cheilitis). A skin biopsy (a medical procedure in which a small sample of tissue is removed from the body for examination) is the gold standard for assessing questionable lip lesions. On closer inspection, tumors that were first assumed to be benign can occasionally be identified as malignancy. A biopsy is helpful since medical professionals might not always be able to diagnose it visually.

• Diagnosis Method: Actinic cheilitis is diagnosed by clinical examination and tissue sample analysis (histopathology).

• Differentiation: Differentiating between squamous cell carcinoma, premalignant actinic cheilitis, and benign inflammation is critical.

• The Golden Rule: The most effective technique for assessing persistent, concerning lip lesions is skin biopsy.

• Biopsy Importance: Numerous lesions that were first thought to be benign were later shown to be malignant, underscoring the need for this operation in precise diagnosis.

• Electron Microscopy: Some recommend utilizing electron microscopy to further evaluate structural changes in actinic cheilitis lesions, and their potential to become malignant, and to assure accurate diagnosis and care, even if it is not necessary for diagnosis.

What Are the Clinical Indications of Actinic Cheilitis?

• Examination: On the lower lip, look for a persistent thickening that feels like sandpaper and is white or reddish.

• Laboratory Work Considerations:

  • For Recently Developed Lesions: For newly developed, symmetric lesions, laboratory testing may be taken into consideration, particularly in younger patients, those with darker skin tones, or those without a history of extended sun exposure, where the risk of skin cancer is lower. By doing so, reversible factors such as vitamin deficiencies, infections, contact, or irritation-related problems are helped to rule out.

• Results of Histopathology:

  • Skin Biopsy: Hyperkeratosis, moderate acanthosis, and a lymphocytic infiltrate surrounding glandular ducts may be discovered during the biopsy.

What Is the Treatment of Actinic Cheilitis?

Treatment for actinic cheilitis is based on the patient's general health as well as the extent, location, and severity of the lip problem. The major objective is to maintain the lips' functionality and appearance while lowering the likelihood that the lip problem may progress to skin cancer. There are various medicinal and surgical treatments available.

• Surgical Options:

  • Excisional Vermilionectomy: Excising the affected region.

  • Electrocautery, Pulse Dye, CO2 Laser, and Cryotherapy: Applying intense heat, cold, or lasers to eliminate abnormal cells. These procedures, meanwhile, have the potential to be intrusive and may result in issues like discomfort, infection, delayed healing, scarring, edema, and tingling.

• Non-Surgical Therapies:

  • Topical Therapies: Medications or creams applied directly to the area in question. Imidazole, Trichloroacetic acid, Imiquimod, and Diclofenac are a few examples. Side effects include discomfort, crusting, and inflammation.

  • Phototherapy: Applying stronger light to repair UV-damaged skin cells. Side effects include discomfort and potential for recurrence.

  • Photoprotection: Reducing sun exposure and delaying the condition's advancement.

• Comparing Treatment Options: An analysis revealed that lesions treated surgically exhibited greater rates of remission and decreased rates of recurrence in comparison to lesions treated medically.

Conclusion

Actinic cheilitis is a lip ailment that is frequently brought on by chronic sun exposure and has the potential to progress to skin cancer. Treatment options include non-surgical techniques including topical therapies and laser treatments, as well as surgical procedures like excisional vermilionectomy. The location, severity, and preferences of the patient all play a role in the therapy decision. Although surgical methods are typically more effective, they may also have greater side effects, and patient compliance problems may make non-surgical approaches less successful. An individualized treatment plan and consistent monitoring are necessary for the successful management of actinic cheilitis.