The resulting oxidative stress can overload the skin’s built-in antioxidant network and cause cellular damage. ROS can react with DNA, forming mutations, and with collagen, leading to wrinkles.

Symptoms include red or pink skin, swelling, tenderness, and a hot sensation when you touch your skin. In some cases, sunburn can cause itching, blistering, or even eye irritation.

"The UV index represents the amount of skin-damaging UV radiation reaching the earth’s surface at any instant of time," the U.S. Environmental Protection Agency says in its UV Index Guide.

Those with Type I or II skin may need just 10 minutes of midday summer sun exposure to reach their vitamin D threshold, while those with Type V or VI skin might require 30 minutes or more under ...

Hurricane Erick makes landfall in Mexico as Category 3 storm, extreme weather grips U.S. Residents and authorities in southern Mexico are assessing the damage and watching for rising rivers as ...