Blocked Underarm Sweat Glands |top| · Trending & Validated

The progression of HS is categorized into three stages (Hurley Stages). In Stage I, a patient might experience a single, painful lump that comes and goes, often mistaken for a boil or an ingrown hair. By Stage II, recurrent abscesses form, with sinus tracts beginning to develop. In Stage III, the most severe form, the entire underarm can become a network of interconnected, draining wounds and thick, immobile scars. Movement of the arm becomes excruciatingly painful. The skin loses its elasticity, and the constant drainage leads to chronic maceration (breakdown) of the surrounding tissue. At this stage, the simple act of putting on a shirt, hugging a loved one, or raising a hand to wave goodbye becomes an act of deliberate, painful planning.

The blockage itself is only the beginning. As the trapped sweat and bacteria accumulate, the duct wall ruptures. This is the critical turning point. The immune system, sensing the leaked contents as foreign invaders, launches a ferocious attack. The result is not a simple pimple or a standard boil (furuncle). Instead, the inflammation burrows deep into the dermis and subcutaneous fat. Patients develop painful, pea-sized to marble-sized nodules that can persist for weeks or months. When these nodules resolve, they don’t simply disappear; they often rupture, draining foul-smelling pus and blood. Over time, with repeated blockages and ruptures, the body attempts to heal by laying down scar tissue. This creates hard, rope-like tunnels under the skin (sinus tracts) that connect multiple lesions, leading to a permanent, weeping, and painful labyrinth of damage. blocked underarm sweat glands

To understand the condition, one must first understand the anatomy. Unlike the eccrine sweat glands found across most of the body (which produce watery sweat for cooling), apocrine glands are concentrated in the armpits, groin, and under the breasts. They produce a thicker, milky secretion that, when combined with skin bacteria, produces body odor. In a healthy individual, this fluid travels through a narrow duct to the skin’s surface. In a person with HS, however, these ducts become clogged with keratin (skin protein) and debris. The exact cause is multifactorial, involving genetics, hormonal fluctuations, and lifestyle factors like smoking and obesity. But the result is uniform: the sweat has no way out. The progression of HS is categorized into three