**Core Concept**
Hidradenitis suppurativa (HS) is a chronic inflammatory skin condition characterized by recurrent, painful abscesses and nodules in the apocrine gland-bearing areas of the body. The pathophysiology of HS involves a complex interplay of genetic predisposition, hormonal influences, and an abnormal immune response.

**Why the Correct Answer is Right**
HS primarily affects the apocrine gland-bearing areas, such as the axillae, groin, and perineal regions. The apocrine glands are modified sweat glands that are responsible for producing a protein-rich secretion, which plays a role in the development of HS. The exact cause of HS is not well understood, but it is believed to involve a combination of genetic and environmental factors, including obesity, smoking, and hormonal influences. The abnormal immune response in HS leads to chronic inflammation, which results in the formation of abscesses and nodules.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because hidradenitis suppurativa is not primarily a disease of the eccrine glands, which are also sweat glands but are more widely distributed on the body surface.
**Option B:** While obesity is a risk factor for hidradenitis suppurativa, it is not the primary disease process.
**Option C:** This option is incorrect because hidradenitis suppurativa is not a disease of the sebaceous glands, which produce sebum and are involved in conditions such as acne.

**Clinical Pearl / High-Yield Fact**
HS is often underdiagnosed or misdiagnosed, and a high index of suspicion is necessary for diagnosis. Clinical features include recurrent, painful abscesses and nodules in apocrine gland-bearing areas, along with signs of chronic inflammation and scarring.

**Correct Answer:** D.