Sunscreens contain a combination of organic and/or inorganic chemicals that absorb or reflect UV rays, preventing them from penetrating the skin. The two main types of UV radiation that are of concern are UVA and UVB rays. UVA radiation can penetrate deeper into the skin and contribute to aging and wrinkling, while UVB radiation causes sunburn and can lead to skin cancer.

Sunscreens are available in various forms, including lotions, creams, sprays, gels, and sticks. Sunscreens work by absorbing, reflecting, or scattering UV radiation, and are classified into two main types: chemical and physical sunscreens. Chemical sunscreens contain organic compounds that absorb UV radiation and convert it into less harmful energy, while physical sunscreens contain inorganic particles that reflect or scatter UV radiation away from the skin. Some sunscreens may also contain antioxidants, which can help neutralize the free radicals generated by UV radiation and prevent oxidative damage to skin cells.

While sunscreen can be effective in protecting against sun damage, it is not a substitute for other sun protection measures, such as wearing protective clothing, seeking shade, and avoiding the sun during peak hours.

This quiz is designed to test your knowledge on sunscreens, their mechanisms of action, indications, potential adverse effects, and appropriate use.

Successful completion of this quiz requires a good understanding of the different types of sunscreens available, their clinical applications, and appropriate use. We encourage you to review the associated learning module before taking the quiz.

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3. Stephen E Wolverton JJW: Comprehensive Dermatologic Drug Therapy 4th edn: Elsevier; 2020