Could the recurrent nodules in the right axilla and groin represent hidradenitis suppurativa instead of a simple staphylococcal infection?

Yes, Hidradenitis Suppurativa Should Be Strongly Considered

Recurrent nodules in the axilla and groin are classic for hidradenitis suppurativa (HS), not simple staphylococcal infection, and this diagnosis must be actively evaluated.

Diagnostic Criteria Point Directly to HS

The presentation described fits the consensus diagnostic criteria for HS, which requires three elements 1, 2:

1. Typical lesions: Painful nodules, abscesses, sinus tracts, bridged scars, or open comedones
2. Typical locations: Axillae and groin are the most common sites for HS
3. Chronicity and recurrence: At least 2 lesions in 6 months OR chronic/persistent lesions for ≥3 months

The axillae and inguinal regions are specifically the most commonly affected areas in HS 1, 2. This anatomical distribution is pathognomonic for the disease.

Why This Is NOT Simple Staphylococcal Infection

Key Distinguishing Features:

• Recurrence pattern: Simple staph infections don't typically recur in the same anatomical regions repeatedly 3, 4
• Location specificity: Staph infections occur randomly; HS targets intertriginous, hair-bearing areas 1, 2
• Bacterial role is secondary: While staphylococci frequently colonize HS lesions, HS is not primarily a bacterial infection 4, 5. The disease is fundamentally a follicular occlusion disorder with immune dysregulation 1

Critical Pitfall to Avoid:

Misdiagnosing HS as recurrent bacterial infection leads to years of inappropriate antibiotic courses without addressing the underlying chronic inflammatory disease 3, 6. This delays proper treatment and allows disease progression with scarring, sinus tract formation, and severe quality-of-life impairment.

What to Look for on Examination

Examine for these HS-specific features 2:

• Double-ended comedones (paired comedones) - highly characteristic
• Sinus tracts connecting lesions
• Bridged scarring (rope-like scars)
• Chronic discharge (serous, purulent, or blood-stained)
• Involvement of other flexural sites: Check submammary regions, buttocks, perineum, posterior auricular areas
• Hurley staging: Assess severity (Stage I: isolated nodules; Stage II: recurrent abscesses with sinus tracts and scarring; Stage III: diffuse involvement with multiple interconnected tracts)

Immediate Management Steps

If HS is confirmed 2:

1. Document Hurley stage for worst-affected region
2. Measure pain (visual analog scale 0-10) and quality of life (DLQI)
3. Screen for comorbidities: Depression, anxiety, diabetes, hypertension, hyperlipidemia, inflammatory bowel disease 2
4. Refer to smoking cessation if relevant (smoking has OR of 36 for HS) 2
5. Refer to weight management if relevant (obesity has OR of 33) 2

Treatment Algorithm:

• Mild disease (Hurley I): Topical clindamycin + oral tetracyclines (doxycycline 100mg or lymecycline 408mg) for ≥12 weeks 2
• Moderate disease or tetracycline failure: Clindamycin 300mg + rifampicin 300mg twice daily for 10-12 weeks 2
• Severe disease (Hurley III) or refractory: Adalimumab 40mg weekly (FDA-approved) or refer for surgical excision 2, 7

The Stakes Are High

HS causes 2, 3:

• Severe quality-of-life impairment (average DLQI score of 8.9 in referred patients)
• Nearly doubled cardiovascular mortality risk compared to controls
• Increased risk of depression and completed suicide
• Chronic pain and malodorous discharge affecting intimate areas
• Long-term complications: Fistula formation, lymphedema, squamous cell carcinoma

Bottom line: The recurrent nature in classic anatomical sites (axilla and groin) makes HS the primary diagnosis to rule in, not rule out. Treating this as simple staph infection will fail the patient.