Which skin type is characterized by excess oil production?

The skin type characterized by excess oil production is oily skin. This condition occurs when the sebaceous glands in the skin produce an overabundance of sebum, leading to a shiny appearance, enlarged pores, and a tendency to develop acne. Oily skin can be influenced by various factors, including hormonal changes, genetics, and environmental conditions.

In contrast, dry skin lacks sufficient moisture, often resulting in flakiness and a tight feeling. Normal skin is generally well-balanced in terms of oil and moisture content, presenting no significant issues. Combination skin exhibits characteristics of more than one skin type, typically showing oiliness in certain areas (like the T-zone) and dryness in others. Therefore, oily skin is distinct in its excessive oil production, making it the correct choice for this question.