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RENEE MONTAGNE, HOST:

It's MORNING EDITION from NPR news. I'm Renee Montagne.

STEVE INSKEEP, HOST:

And I'm Steve Inskeep. Good morning.

Today in Your Health, we're going to take a little better care of your skin. We'll have a new way to detect poison ivy. And we begin with acne - the scourge of many a teenager's life, which is getting harder to treat. NPR's Patti Neighmond reports on why and what doctors are trying to do about it.

PATTI NEIGHMOND, BYLINE: It's every teenager's nightmare - big, blistery red bumps on their face.

ROHINI BAGRODIA: That's what people notice first about you, so no matter how great of a person you are, no matter how pretty your eyes are, how nice your smile is, people always notice the blemishes on your face.

NEIGHMOND: Rohini Bagrodia is a really pretty 22-year-old with beautiful eyes, a great smile, and a history of battling acne. In school, it meant avoiding the spotlight.

BAGRODIA: I would always shy away from those opportunities that, you know, would bring all the focus on me.

NEIGHMOND: She wouldn't take part in class discussions or raise her hand. And it's all because of a tiny bacteria that lives on the skin. UCLA dermatologist Dr. Jenny Kim says many people don't realize it's bacteria that causes acne.

DR. JENNY KIM: Some people say your face is dirty, you need to clean it more or scrub more or don't eat chocolate and certain things like that. It's most likely the bacteria and the oil inside that will allow the bacteria to overpopulate.

NEIGHMOND: For most teenagers with mild acne, over the counter products containing peroxide or salicylic acid are enough to clear up the acne. But lots of teenagers end up in the doctor's office getting antibiotics. And this was the hardest thing for Bagrodia. No matter how much she followed doctor's orders, diligently cleaning her face and using antibiotic cream, nothing worked. Dermatologist Elizabeth Martin says this bacteria, like many others, is mutating quickly and becoming resistant to antibiotics.

DR. ELIZABETH MARTIN: Over the years we have seen an increase in this antibiotic-resistant bacterium both in the U.S. and also worldwide.

NEIGHMOND: Studies show a tripling of drug resistant acne bacteria over the past few decades. This means the doctors can no longer rely on antibiotics alone. Most doctors now use a combination of low dose antibiotics, along with benzoyl peroxide, which also kills acne-causing bacteria.

MARTIN: And this medicine works to decrease bacteria through a different mechanism than antibiotics and it helps to prevent the development of resistant bacteria. When we combine benzoyl peroxide along with an antibiotic, patients tend to have better clearance of their acne than when an antibiotic is used alone.

NEIGHMOND: Retinoids, which are vitamin A derivatives, can also be used early on to treat acne. Typically creams, they work by unclogging pores before they become large, inflamed bumps. A stronger form, called Accutane, is used for severe acne. It's a pill and it's highly effective, but it can cause serious side effects, including depression and birth defects. So the government regulates its use.

UNIDENTIFIED WOMAN: So this is a blue light.

NEIGHMOND: This is the laser and light room at UCLA's dermatology center. Intense focused light and lasers can help fight acne when other treatments fail. UCLA dermatologist and researcher Dr. Jenny Kim stands in front of a half cylinder which holds layers of light bulbs.

KIM: So patients with acne can go right under the blue light, and they sit there for about 15, 20 minutes, and then the acne improves after several treatments.

NEIGHMOND: It's not known exactly how light therapy works to fight acne, but Kim says studies indicate it destroys the bacteria.

KIM: Probably physically without giving it time to mutate. Another thing is that the light treatment can improve the inflammation that the bacteria causes in acne.

NEIGHMOND: But laser and light therapy don't work for everyone. It's expensive and typically not covered by insurance. So Kim and colleagues are also looking into an entirely new way to fight acne: taking a harmless virus that lives on the skin and programming it to become a bacteria killer.

KIM: The virus is going to go and kill bacteria that causes acne. It's just going to break it apart and burst its membrane so there's no time for the bacteria to mutate.

NEIGHMOND: Sort of a surprise attack. It's a promising way to get rid of acne without using antibiotics. If further lab studies prove successful, Dr. Kim will test the treatment on people.

Patti Neighmond, NPR News.

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