Why do hs flare ups happen

Overview

Hidradenitis suppurativa (HS), also known as acne inversa, is a chronic inflammatory skin condition characterized by recurrent painful nodules, abscesses, and sinus tracts in apocrine gland-bearing areas. First described by French surgeon Alfred Velpeau in 1839 and later named by American dermatologist George Henry Fox in 1885, HS has been historically misunderstood and often misdiagnosed. The condition affects approximately 1-4% of the global population, with prevalence varying by region and ethnicity. HS typically presents after puberty, with peak onset between ages 20-40, and follows a chronic course with periods of remission and exacerbation. The disease has significant quality of life impacts, with studies showing HS patients have higher rates of depression (up to 42%) and anxiety compared to the general population. Diagnosis is primarily clinical, based on characteristic lesions in typical locations, with the Hurley staging system (developed in 1989) used to classify disease severity into three stages.

How It Works

HS flare-ups occur through a complex interplay of genetic, immunological, and environmental factors. The primary mechanism involves follicular occlusion, where hair follicles become blocked with keratin, leading to rupture and subsequent inflammatory response. This triggers an abnormal immune response involving cytokines like TNF-α, IL-1β, and IL-17, which promote chronic inflammation. Genetic factors play a significant role, with mutations in the γ-secretase complex genes (NCSTN, PSENEN, PSEN1) identified in some familial cases. Hormonal influences are evident, as flares often correlate with menstrual cycles in women and improve during pregnancy. Environmental triggers include mechanical friction from tight clothing, heat and sweating, smoking (which increases risk by 90%), obesity, and stress. The inflammatory process leads to destruction of apocrine glands and formation of sinus tracts, creating a cycle of inflammation, infection, and tissue damage that perpetuates the disease.

Why It Matters

HS matters because it significantly impacts patients' physical health, mental well-being, and quality of life. The condition causes chronic pain, with 70% of patients reporting daily pain that interferes with work and daily activities. HS leads to substantial disability, with patients missing an average of 26 work days per year. The visible nature of lesions often causes social isolation, relationship difficulties, and employment challenges. Economically, HS imposes high healthcare costs, with annual direct medical costs estimated at $8,000-$12,000 per patient in the U.S. Early diagnosis and proper management are crucial, as delayed treatment can lead to progressive scarring, contractures, and rare complications like squamous cell carcinoma. Increased awareness and research are needed to develop better treatments and reduce the average 7-year diagnostic delay many patients experience.