Using a loofah with a richly lathered body wash and some aromatherapy candles can make an at-home spa treatment feel like you're getting pampered at a posh spa. Those spongy pouf balls also make for great exfoliators.

"[Loofahs] are good for removing dead skin cells leaving the skin smooth and conditioned. Scrubbing the skin two to three times a week will enhance circulation and promote the excretory function of the skin," explains cosmetic dermatologist Dr. Paul Jarrod Frank .

But reaching for a germy, old, or shared loofah when you take a warm shower or bath could potentially do more harm than good to your skin.

Due to their abrasiveness and the fact they can harbor bacteria, mold and germs, Dr. Elizabeth Tanzi , co-director of the Washington Institute of Dermatologic Laser Surgery, not only cautions against using a loofah too roughly and too frequently; she also warns that sharing them is a big no-no.

Dr. Stafford Broumand , plastic surgeon and associate clinical professor of plastic surgery at the Mount Sinai Medical Center, echoes this warning: "Bacterium is attracted to moisture and loves to grow in the nook and crannies of a loofah. Some of the bacteria might be something like P. aeruginosa (which has been linked to drug-resistant infections )."

"The most likely route of infection [from a loofah] is through broken skin -- nicks and cuts from shaving are particularly susceptible," says Dr. Heidi Waldorf , the director of laser and cosmetic dermatology at The Mount Sinai Medical Center in New York. "Infections can show up as folliculltis (red bumps and pustules at hair follicles) or as impetigo (yellow-oozing or crusting on a red base)."

According to Frank, lab results found that loofahs contain two different organisms: acinetobacter, which can cause wound infections, boils and conjunctivitis, and yeast, the most common form of which is Candida. Candida can cause rashes around the mouth called perleche , as well as other various rashes and infections.

There is also documentation that using contaminated loofahs can prompt the development of folliculitis and even perleche , which is a rash around the mouth, so Broumand recommends keeping the bathing accessory away from bodily fluids, including the mouth, eyes and genitals. In other words, avoid scrubbing away on your face and private parts, and stick to using a loofah on your body.

To keep your loofah germ-free, follow these derm-approved tips:

• Use loofahs made out of natural substances rather than synthetics. Our editors' picks are the Julep Konjac Cleansing Sponge and EcoTools EcoPouf Bath Sponge .

More beauty myths that we've debunked (or proven true):

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