How does hs start

Overview

Hidradenitis suppurativa (HS), also known as acne inversa, is a chronic inflammatory skin condition that primarily affects areas with apocrine sweat glands. First described by French surgeon Alfred Velpeau in 1839 and later named by German dermatologist Robert Willan in 1845, HS has been recognized as a distinct medical condition for nearly two centuries. The condition is characterized by recurrent painful nodules, abscesses, and sinus tracts that develop in intertriginous areas where skin rubs together. HS affects approximately 1-4% of the global population, with higher prevalence in certain ethnic groups including African Americans. The condition has strong genetic components, with about 30-40% of patients reporting family history of HS. Historically misdiagnosed as simple boils or infections, HS was officially classified as an inflammatory disease in the 20th century and is now understood to involve complex immune system dysregulation.

How It Works

HS begins with follicular occlusion - the blockage of hair follicles in apocrine gland-bearing skin. This initial blockage occurs due to abnormal keratinization (skin cell shedding) that plugs the follicular opening. Once blocked, the follicle becomes distended with keratin and cellular debris, creating pressure that eventually causes rupture of the follicular wall. This rupture releases follicular contents into the surrounding dermis, triggering a robust inflammatory response involving neutrophils, lymphocytes, and macrophages. The immune system responds with cytokine release (particularly TNF-α, IL-1β, and IL-17), leading to abscess formation. As the condition progresses, recurrent inflammation causes destruction of hair follicles and apocrine glands, with formation of sinus tracts (tunnels under the skin) that connect multiple abscesses. These tracts can extend several centimeters and often become secondarily infected with bacteria like Staphylococcus aureus. The process follows a predictable pattern: follicular occlusion → follicular rupture → inflammatory response → abscess formation → sinus tract development → scarring and chronic inflammation.

Why It Matters

HS matters significantly because it causes substantial physical and psychological burden, with patients reporting quality of life scores comparable to those with severe chronic conditions like rheumatoid arthritis or inflammatory bowel disease. The condition leads to an average of 2-5 work days missed per month due to pain and medical appointments, creating economic impact through lost productivity. HS increases risk of serious comorbidities including metabolic syndrome (present in 40-50% of patients), cardiovascular disease, and depression (affecting approximately 30% of patients). Early diagnosis and treatment are crucial as delayed intervention leads to more severe disease progression and permanent scarring. Proper management can prevent complications like squamous cell carcinoma (which occurs in 3-4% of long-standing HS cases) and reduce healthcare costs estimated at $1.5-2.5 billion annually in the United States alone. Increased awareness helps reduce the average 7-year diagnostic delay many patients experience.