If diamonds are a girl's best friend, then pimples are her worst enemy — especially when they show up just in time for an important event.

For those not inclined to see a dermatologist for an emergency treatment involving sharp metal instruments and cortisone, Gervaise Gerstner, M.D., of Wexler Dermatology, in Manhattan, suggests a dab of toothpaste to dry out the pimple. New York City makeup artist Maria Verel prefers icing the area for a similar effect. "Then hold a cotton pad soaked in allergy-relief eyedrops on the spot for five minutes," she says. Gerstner concurs: "The vasoconstrictors in the drops shrink blood vessels, which reduces redness."

For small pimples, use a product containing salicylic acid. Almay Clear Complexion Blemish Healing Spot Concealer ($7 at drugstores) both dries out and covers up. Verel likes Benefit’s Galactic Shield! ($18, www.sephora.com) and, for bigger bumps, Boo Boo Zap! ($18, www.sephora.com). Zap that zit and nothing will distract from your party dress.