Which of the following is a symptom of seborrheic dermatitis?

Seborrheic dermatitis is characterized primarily by the presence of dry or oily scaling, which reflects the condition's impact on the skin's oil production and overall health. Patients often experience patches of red skin covered with flaky scales that may appear either dry or oily, often on areas rich in sebaceous (oil) glands, like the scalp, face, and upper back. This scaling can vary significantly among individuals, with some experiencing more moisture and others having drier skin.

The other options do not align with the symptoms of seborrheic dermatitis. Excessive hair growth is typically associated with hormonal imbalances or conditions like hirsutism, rather than seborrheic dermatitis. The presence of blackheads and whiteheads indicates acne or comedonal acne, which involves clogged pores, and does not relate to seborrheic dermatitis. Puffy eyes are often linked to allergies or fluid retention and are not a symptom of seborrheic dermatitis. Therefore, the correct identification of dry or oily scaling as a symptom highlights the distinctive nature of this condition in dermatological terms.