A flaky scalp seems like it should have a straightforward fix: Add moisture, wash less, maybe try whatever scalp oil the internet is currently obsessed with. But if those flakes come with persistent itching and inflammation, you might have seborrheic dermatitis — and some of that advice could make it worse. This chronic inflammatory skin condition tends to affect areas with plenty of oil-producing glands. The scalp is a common spot, but it can also show up around the eyebrows, ears, beard, and chest. Dandruff falls on the milder end of the same spectrum. “It does not have the inflammation that we see with seborrheic dermatitis,” says Gloria Lin, M.D., a board-certified dermatologist at Schweiger Dermatology Group based in New York City.
The condition is surprisingly common: A recent study estimated its global prevalence at roughly 4.4%. A yeast called Malassezia normally lives on healthy skin without symptoms, but in people with seborrheic dermatitis, the skin can react with inflammation even when there isn’t an unusually large amount of yeast present. Everyday factors like stress, sweating, and your hair-washing routine can also influence flare-ups, making the condition more complicated than a simple yeast problem. That complexity leaves plenty of room for misconceptions, so ahead, our experts clear up some of the most common myths.
