Apply plenty of broad-spectrum, water-resistant, SPF 30 or higher sunscreen to exposed/uncovered skin 15 to 30 minutes before going out into the sun, and reapply frequently throughout the day and straight after coming out of the water and drying off with a towel. Remember, sunscreens should not be used as an alternative to clothing and/or shade, rather they offer additional protection. No sunscreen will provide 100% protection.

Answered by Alex Kelleher, MD