Protection is a practice. Not just a number.

UVA penetrates more deeply into skin and contributes to photoaging and pigmentation. UVB is a major cause of sunburn. Both contribute to skin damage and skin-cancer risk; neither is harmless. Some UVA passes through window glass.

SPF compares the UV exposure needed to cause sunburn on protected versus unprotected skin under standardized testing. It primarily describes UVB-related protection, not a duration of protection. Broad-spectrum protection addresses UVA as well as UVB; the SPF number alone cannot establish UVA performance.

Time outdoors, UV intensity, season, altitude and reflective surfaces influence exposure. Clouds do not block all ultraviolet radiation. Short periods outdoors and exposure while travelling may contribute to cumulative damage.

More melanin provides some natural protection but does not eliminate sun damage or skin cancer. UV and, for some pigmentation conditions, visible light can worsen dark spots and melasma. Protection should be suited to exposure and the individual concern.

AAD guidance recommends a broad-spectrum, water-resistant sunscreen with SPF 30 or higher when outdoors, alongside shade and protective clothing. Regular protection helps reduce sunburn and cumulative damage; sunscreen is one part of risk reduction, not a complete shield.

Water resistance is a separately tested label claim, not something that can be assumed from SPF or texture. Tinted sunscreen with iron oxides may be useful when visible light worsens pigmentation. This is general guidance, not a claim that the CUTIS sunscreen is water-resistant or contains iron oxides.

Apply sunscreen before going outdoors—AAD guidance advises about 15 minutes beforehand—and cover all exposed skin, including ears, neck and the backs of hands. Most adults need about one ounce to cover exposed body skin, adjusted for the area exposed. Thin application reduces effective protection.

Reapply approximately every two hours outdoors and after swimming or sweating; follow the product’s water-resistance instructions where verified. Towelling can remove protection. Seek shade, wear a broad-brimmed hat, suitable clothing and sunglasses, and avoid relying on sunscreen to extend time in strong sun.

“SPF 60 means 60 hours of protection.” SPF is not a clock. Application, rubbing, sweat and exposure all affect protection.

“Darker skin does not need sunscreen.” All skin tones can be damaged, and pigmentation concerns may become more persistent with exposure.

“One application lasts all day.” No sunscreen remains perfectly intact through a day of outdoor activity. Reapplication and other protective habits matter.

Have a new, changing, bleeding or non-healing lesion assessed. A mole with asymmetry, an irregular border, uneven color or evolution deserves attention; concerning lesions can also be small.

Seek medical help for severe sunburn with extensive blistering, systemic symptoms or signs of dehydration. People with a history of skin cancer, photosensitivity or medicines that increase sun sensitivity should discuss individualized protection.