What skin condition is characterized by excessive oiliness?

Seborrhea is characterized by an excessive production of oil by the sebaceous glands, leading to an oily appearance of the skin and often resulting in flaking or dandruff in more severe cases. The condition occurs when the normal regulation of oil production is disrupted, which can be influenced by factors like hormones, environmental conditions, and genetics.

This oiliness associated with seborrhea can also contribute to other skin issues, such as inflammation or bacterial growth, but the predominant feature is the excessive secretion of sebum. Other conditions like acne can be associated with oily skin but are characterized by clogged pores and inflammation, rather than oiliness alone. Eczema is primarily associated with dryness and irritation, while pustules refer to specific lesions that can occur in various skin conditions, including acne but do not represent a skin condition by themselves. Thus, seborrhea stands out as the most direct answer regarding excessive oiliness.