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Seborrheic dermatitis is a skin condition that can cause a red, itchy rash along the hairline. In most cases, seborrheic dermatitis starts out as little more than dandruff, or flaky skin on the scalp. However, as a case of seborrheic dermatitis worsens, it may produce yellow or red acne-like pimples and scaly skin along the hairline. Seborrheic dermatitis can turn up elsewhere, too, including the eyebrows, ears, nose, back, and other parts of the body.
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