This is the severe, chronic end of the spectrum. Often misdiagnosed as "infected sweat glands," HS is actually an auto-inflammatory disease affecting the apocrine glands (armpits, groin, buttocks).
Blocked sweat glands encompass a spectrum from the trivial (miliaria crystallina) to the chronic and debilitating (Fox-Fordyce disease, widespread miliaria profunda). Eccrine duct obstruction is typically environmental and self-limiting, while apocrine duct obstruction (Fox-Fordyce) often requires long-term management. Hidradenitis suppurativa, despite historical classification as a sweat gland disorder, is now understood as follicular occlusion. Accurate diagnosis rests on lesion morphology, distribution, and association with sweating. Treatment centers on cooling, drying, removing occlusive factors, and in chronic cases, retinoids, hormonal therapy, or laser ablation. Failure to recognize widespread anhidrosis can lead to life-threatening hyperthermia.
To understand a blockage, one must understand the anatomy. The human body possesses roughly 2 to 4 million sweat glands, primarily divided into two types: (ubiquitous, clear, odorless sweat) and Apocrine (located in armpits/groin, linked to hair follicles, responsible for "body odor").