If you think you touched either oak, ivy or sumac, do not touch your face, other body parts or even other people because you could spread the plant oils that cause the rash. Go home and scrub all exposed areas with soap and warm water; then wash your clothes. If you develop an itchy rash, treat yourself with cool, wet compresses and an over-the-counter hydrocortisone cream to combat swelling and itch. "If it's a significant case -- where the rash is spread over much of your body, especially on the face or near your eyes, see a doctor," Wolf says. "You might need an oral cortisone."

Cold sores/fever blisters
Exposure to sunlight causes these nasty little lip sores to flare up. That's because UV rays react with the dormant cold-sore virus and cause it to reactivate. Always keep your lips coated with a lip balm containing sunscreen. If you do get a sore or fever blister, continue to keep it coated with balm, and try to avoid the sun until it goes away.

Sunburn
OK, we all know how important it is, but not nearly enough of us actually use sunscreen: One-third of people who spend time outdoors don't. Meanwhile, the American Academy of Dermatology reports that melanoma -- which is often linked to sun exposure -- is increasing steadily, claiming about 7,300 American lives in 1999.