It affects the inverse anatomical regions compared to common acne.
- Acne Vulgaris: Affects extensor surfaces and open areas (Face, Back, Chest).
- Acne Inversa: Affects intertriginous/flexural areas (Axilla, Groin, Perineum, Inframammary folds).
Epidemiology
Etiology
Pathophysiology
- Follicular occlusion (keratin plug) in apocrine-bearing skin (axilla, groin); NOT primarily infectious.
- Risk Factors: Smoking (major), Obesity, Metabolic syndrome.
Clinical features
- Deep-seated, painful nodules and abscesses.
- Draining sinus tracts (tunnels under the skin) with malodorous discharge.
- Double-ended comedones (blackheads) and hypertrophic scarring (bridging scars).
- Distribution: Intertriginous areas (Axillae, inguinal, perineal, inframammary).
- Course is chronic and relapsing.
