Model: Trunk Archive, Product: Chris Eckert/Studio D.

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Step 2: Moisturize
Now comes the hydration. If you want ultrasoft skin (and who doesn't?), look for two kinds of ingredients, advises Naana Boakye, MD, a dermatologist in Englewood Cliffs, New Jersey. "Occlusive moisturizers, such as jojoba oil or petrolatum, work by forming a barrier that blocks water from escaping the skin," Boakye says. "Humectants like glycerin, urea, and hyaluronic acid attract water to skin." To harness maximum benefits, choose a product containing both types. Keep in mind that generally, the thicker the moisturizer, the stronger it is: A butter is more hydrating than a lotion, which is more powerful than a milk. One effective trick for extra-dry skin is to apply a layer of oil to damp skin first and then seal it with a coat of cream.

Tough Problem

Skin on elbows, knees, and heels tends to be thicker than the skin on the rest of the body; it's also drier. To eradicate rough, flaky patches, Boakye suggests a lotion or cream containing lactic acid or urea, which are exfoliants as well as humectants, to improve texture and hydrate. Apply daily and you should see improvement in three to four weeks, she says.

Red or white bumps on your upper arms and thighs may be due to keratosis pilaris, the buildup of dead cells around hair follicles. Boakye often prescribes a regimen of a 15 percent glycolic acid lotion daily, along with a scrub two or three times a week. "It usually takes up to three weeks to see significant improvement," she says.

For the skin on your neck and chest, you can use the same treatment products you use on your face, with a caveat: This skin is thinner and has fewer oil glands, so it's more sensitive to active ingredients, says Brooke Jackson, MD, a dermatologist in Chapel Hill, North Carolina. Dilute facial treatments, like vitamin C serums and retinoids, by blending them with a pea-size drop of moisturizer. And remember to prevent further damage by applying an SPF 30 daily, says New York City dermatologist Ellen Marmur, MD.