Which skin condition is characterized by the presence of excess oil production?

The condition characterized by excess oil production is acne. Acne occurs when hair follicles become clogged with oil and dead skin cells. This overproduction of sebum, which is the oily substance produced by sebaceous glands, creates an environment conducive to the growth of bacteria, leading to inflammation and the development of acne lesions such as pimples, blackheads, and cystic nodules.

In contrast, dry skin does not involve excess oil; rather, it is marked by a lack of moisture and can lead to flakiness and irritation. Psoriasis is an autoimmune condition that leads to the rapid buildup of skin cells resulting in scaling, which is not directly related to oil production. Eczema, or atopic dermatitis, is also associated with dry, itchy skin and does not involve excess oil. Thus, acne is the clear example of a condition linked to excessive oil production in the skin.