A day at the beach or on the slopes can cause burned, chapped lips. To prevent them, wear a lip balm with SPF 30 and reapply every 30 minutes. Try Supergoop! AcaiFusion Lip Balm Broad Spectrum SPF 30, $9.50, or Sebamed Lip Defense Stick SPF 30, $4.99. If your lips are already chapped, however, SPF could irritate them further.

"When it comes to lip care I think that less is more," explains Dr. Prystowsky. "The more products you introduce to your lips, the more likely you are to develop a negative reaction. And often it's just not worth it." In other words: Find the products that work for you, and stick with them.

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"If you are over 40 and have dry, rough areas on your lips, it could be due to sun damage, and may even be due to a precancerous growth or even lip skin cancer," warns Prystowsky. "See your dermatologist if the usual remedies for dry lips do not work."

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