A Real Head Scratcher

NEWS Procter & Gamble, maker of Head & Shoulders, announced last month that it had figured out what really causes dandruff. The culprit, it said, is a couple of yeastlike funguses, M. restricta and M. globosa, and not the fungus that has long been a primary suspect, M. furfur.

SECOND OPINION A bit flaky, or at least an oversimplification, say independent dermatologists. "No one knows for sure what causes dandruff," says Bruce Robinson, a dermatologist and spokesman for the American Academy of Dermatology. "That's the frustrating part." Fungus may be the root cause, says Robinson, or it may simply be "a...

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