Final answer:
The condition causing chronic, inflammatory, recurring scarring of the pilosebaceous ducts is Acne vulgaris. It involves sebum overproduction and bacterial infection, often leading to scarring.
Step-by-step explanation:
The condition that causes chronic, inflammatory, recurring, scarring of the pilosebaceous follicular ducts is a) Acne vulgaris. Acne is a common skin disturbance that occurs where there are many sebaceous glands, such as on the face and back. It often begins during puberty but can continue into adulthood. The development of acne is closely related to the overproduction of sebum, which, combined with keratin, can block hair follicles. This blockage creates a plug that can become infected with bacteria, resulting in inflammation and, potentially, scarring of the skin.