This may involve aprocrine glands anywhere within the 'milk line', running from the labia majora to the axilla. It is found more commonly in darker pigmented individuals, begins after menarche and improves after menopause. Long-standing hidradenitis results in multiple skin abscesses, draining subcutaneous sinus tracts, scarring, and deformity.
The presence of cellulitis, deteriorating vital signs and a deep, spreading, painful erythema should raise this possibility. This is extremely rare but is a surgical emergency requiring extensive debridement of the necrotic fascia to prevent septic shock and fatal complications. Magnetic resonance imaging can effectively diagnose the condition. Risk factors for necrotising fasciitis include diabetes mellitus, arteriosclerosis, obesity, hypertension, and prior irradiation.