A skin disorder characterized by chronic inflammation of the sebaceous glands caused from retained secretions is:

Acne is defined as a skin disorder marked by chronic inflammation of the sebaceous glands, which are responsible for producing sebum, an oily substance that helps to keep the skin moisturized. When these glands become clogged with excess sebum and dead skin cells, it creates an ideal environment for bacteria to proliferate, leading to inflammation, redness, and the formation of pustules, papules, and sometimes cysts. This process is influenced by hormonal changes, which often result in increased oil production, particularly during adolescence or hormonal fluctuations in adults.

Understanding the nature of acne helps to recognize its manifestation on the skin, often presenting as pimples, blackheads, and sometimes deeper cystic lesions. Other conditions, such as rosacea, eczema, and psoriasis, although they may involve inflammation, have different causes, symptoms, and affected skin areas, making them distinct from acne.