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The machines: Once strictly industrial tools, lasers have transformed some areas of medicine, such as dermatology. There are dozens of different types, from cold, or so-called low-level, lasers, to sophisticated, high-powered devices. Others use radio waves, heat or pulses of intense light. The energy and light work at the cellular level of the skin, changing pigment and other skin imperfections.•

Possible uses: Skin rejuvenation, cellulite removal, hair, birthmark and tattoo removal, and improvement of acne and acne scarring, age and sun spots, skin irregularities, saggy, loose skin and facial and leg veins.Who does the procedure: A doctor does not have to do the treatment, but be sure that whoever is performing it is properly trained and supervised. Talk to the medical director at the center you choose about how he or she ensures safe, high-quality work.•

Where it is done: Procedures are mostly done at doctor's offices and other medical centers.•

What it feels like: Usually not painful, the devices may be so bright that the intensity may be initially unsettling. It may feel as if someone snapped a rubber band against your skin.•

Is it safe? Yes, though there may be redness afterward. Some machines automatically shut off to protect patients if the devices get too hot, or have a cooling spray that minimizes side effects.•

Cost and insurance issues: Costs vary widely, depending on the problem and number of treatments. Sessions can start at $100 each and go up as high as several thousand dollars for a package. Insurance usually doesn't cover what it deems cosmetic.