Which skin condition is characterized by excessive oiliness?

Seborrhea is a skin condition characterized by excessive oiliness, primarily affecting areas of the skin that have a high concentration of sebaceous (oil) glands. This condition leads to an overproduction of sebum, resulting in an oily appearance and often accompanying symptoms such as redness, itching, or flaking of the skin. Seborrhea is commonly observed on the scalp, face, and upper body, presenting as shiny or greasy skin and may also lead to conditions like seborrheic dermatitis, which further aggravates the skin's appearance.

Understanding this characteristic can help in providing appropriate skin care and treatments aimed at managing oil production and maintaining skin health. In contrast, the other options reflect different skin conditions: dry skin entails a lack of moisture, eczema is related to inflammatory responses and is often itchy and red, and rosacea is associated with redness and visible blood vessels but not necessarily with excessive oiliness.