**Core Concept**
Hidradenitis suppurativa (HS) is a chronic inflammatory skin disorder characterized by recurrent, painful, and recurrently inflamed nodules, abscesses, and sinus tracts, primarily affecting apocrine gland-bearing areas of the body.

**Why the Correct Answer is Right**
HS is a disease of apocrine glands, which are a type of sweat gland found in the axillae, groin, and other areas where they contribute to body odor. The apocrine glands in these areas become inflamed and clogged, leading to the characteristic lesions of HS. This inflammation is thought to be due to a combination of genetic predisposition, hormonal influences, and an abnormal immune response.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because HS is not primarily a disease of eccrine glands, which are a type of sweat gland found all over the body and are not associated with body odor.
* **Option B:** This option is incorrect because HS is not primarily a disease of sebaceous glands, which produce sebum and are associated with acne, not HS.
* **Option C:** This option is incorrect because HS is not primarily a disease of hair follicles, although hair follicles can become involved in the inflammatory process.

**Clinical Pearl / High-Yield Fact**
HS is often associated with other conditions, including obesity, smoking, and mental health disorders, and is considered a chronic and debilitating disease that requires a multidisciplinary treatment approach.

**Correct Answer:** C.