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Mehmet Oz, MD, Cardiology, answeredSeborrheic dermatitis is a skin condition that can cause a red, itchy rash on or around the nose. 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 on the bridge of the nose or on the skin surrounding the nose. Seborrheic dermatitis can turn up elsewhere, too, including the hairline, eyebrows, ears, back, and other parts of the body.