- Chronic inflammatory skin disease manifested as recurrent inflammatory nodules, abscesses, sinus tracts, and complex scar formation
- Areas affected are tender, malodorous, often with exudative drainage.
- Has higher risk of concomitant decrease in quality of life secondary to physical, emotional, and psychological stress
- Common in intertriginous skin regions: axillae, groin, perianal, perineal, inframammary skin
- System(s) affected: skin, psychosocial
- Synonym(s): acne inversa; Verneuil disease; apocrinitis; hidradenitis axillaris
- Predominant sex: female > male (3:1)
- African Americans
Peak onset during 2nd and 3rd decades of life but can be found from puberty until age 40 years
Etiology and Pathophysiology
- Not fully understood; previously considered a disorder of apocrine glands but more recently thought to be due to a follicular epithelium defect; deregulation of the local immune system may also play a role.
- Hormonally induced ductal keratinocyte proliferation leads to a failure of follicular epithelial shedding, causing follicular occlusion.
- Mechanical stress on skin (intertriginous regions) precipitates follicular rupture and immune response.
- Bacterial involvement is a secondary event.
- Rupture and reepithelialization cause sinus tracts to form.
- Familial occurrences suggest single gene transmission (autosomal dominant), but the condition may also be polygenic.
- Estimated 40% of patients have an affected family member.
- Lithium may trigger onset of or exacerbate this condition.
- Lose weight if overweight or obese.
- Smoking cessation
- Avoid constrictive clothing/synthetic fabrics, frictional trauma, heat exposure, excessive sweating, shaving, depilation, and deodorants.
- Use of antiseptic soaps
Commonly Associated Conditions
- Acne vulgaris, acne conglobate
- Perifolliculitis capitis abscedens et suffodiens (dissecting cellulitis of scalp)
- Pilonidal disease
- Metabolic syndrome/obesity
- Polycystic ovary syndrome (PCOS) and androgen dysfunction
- Thyroid disease
- Arthritis and spondyloarthritis (seronegative)
- Inflammatory bowel disease
- Squamous cell carcinoma
- PAPASH syndrome (pyogenic arthritis, pyoderma gangrenosum, acne, and suppurative hydradenitis)
- Type 2 diabetes mellitus
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