Sunscreens: safety, efficacy and appropriate use.

Area of Science:

• Dermatology
• Public Health
• Photoprotection

Background:

• Ultraviolet (UV) radiation exposure is a primary cause of skin damage, premature aging, and skin cancers.
• Broad-spectrum sunscreens, combining chemical and physical agents, are crucial for mitigating UV-induced harm.
• Emerging sunscreen formulations offer improved cosmetic acceptability and broad-spectrum protection.

Purpose of the Study:

• To review the role of sunscreens in preventing UV radiation-induced skin damage and skin cancers.
• To assess the efficacy and safety of various sunscreen ingredients and formulations.
• To emphasize the importance of sunscreens within a comprehensive sun protection strategy.

Main Methods:

• Review of current scientific literature on sunscreen efficacy, safety, and application.
• Analysis of the impact of sunscreens on skin cancer prevention, including precancerous lesions.
• Evaluation of factors influencing sunscreen effectiveness, such as Sun Protection Factor (SPF) and user behavior.

Main Results:

• Sunscreen use significantly reduces the incidence of solar keratosis and recurrence of squamous cell carcinomas.
• Early-life sunscreen application may play a role in preventing basal cell carcinomas.
• Current sunscreen ingredients rarely cause allergic reactions, and Vitamin D levels are not significantly impacted by regular use.

Conclusions:

• Sunscreen use is an integral component of skin cancer prevention programs.
• Optimal photoprotection involves correct sunscreen application, appropriate SPF selection, and behavioral changes like avoiding peak sun hours and wearing protective clothing.
• Melanoma risk is more closely linked to sun-seeking behaviors than to sunscreen use itself.