What does seborrhea refer to?

Seborrhea refers specifically to an excessive secretion of sebum from the sebaceous glands. This condition often leads to oily skin and can contribute to various skin issues, including acne and dandruff. The sebaceous glands are responsible for producing sebum, an oily substance that helps lubricate and protect the skin. When there is an overproduction of sebum, it can result in a greasy appearance, clogged pores, and other related skin concerns.

The other options address different skin conditions; excessive dryness of the skin would relate to xerosis or dry skin conditions, while an allergic reaction involves the immune system's response to allergens. Inflammation of the skin, on the other hand, is typically characterized by redness, swelling, and irritation, commonly seen in conditions such as dermatitis or eczema.