Essential rules for summer skin protection from a seasoned pro.

If you have to embark on an 11- mile jungle trek in the dead of summer, it’s handy to have a nurse along. That’s what Margaret Bobonich’s teammates discovered during 2005’s Survivor: Guatemala season, which found the dermatology nurse practitioner tending to dehydration, torn muscles and a poisonous barbed plant injury after her team won the grueling first challenge.

Ousted halfway through her season, Bobonich returns to Guatemala annually with nonprofit Refuge International and practices full-time at Cleveland’s University Hospital, Case Medical Center.

You may not (hopefully) be lost in the wild this summer, but you should still protect your skin with Bobonich’s tips.

• Do wear a hat and SPF 30 outdoors, and reapply every two hours.

• Don’t spend more than four hours in direct sun, even if you’re protected. Break it up with some shade time. “The sun plays a big part in breaking down skin so that you get more wrinkles and dark spots,” Bobonich says.

• Do wash up immediately after you’re exposed to poison ivy. “The oil stays on our skin and causes irritation as long as it’s there,” Bobonich says.

• Don’t use soap—especially the antibacterial kind—on your face and body. Opt for a gentle cleanser.

• Do take cooler, shorter showers to help keep skin hydrated.

• Do use petroleum jelly for wound and burn care. “Hydrated wounds heal faster and better, and the jelly also prevents scarring,” she says. It’s also a great, non-allergenic moisturizer.

This article originally appeared as on American Profile