What is Bockhart's Impetigo?
Bockhart's impetigo is a superficial folliculitis characterized by fine pustules appearing at the opening of hair follicles in the beard area, typically caused by Staphylococcus aureus infection and often associated with shaving 1.
Key Clinical Features
Bockhart's impetigo represents a distinct clinical entity that differs from the more commonly discussed forms of impetigo (bullous and nonbullous):
- Location: Specifically affects the beard area and hair follicles
- Appearance: Fine pustules at follicular openings rather than the honey-colored crusts of classic impetigo or the large bullae of bullous impetigo
- Pathogen: Staphylococcus aureus is the causative organism 1
- Association: Frequently related to shaving trauma
Clinical Progression and Related Conditions
If left untreated, Bockhart's impetigo can progress to more severe infections:
- Sycosis barbae: A deeper-seated infection that develops when the superficial folliculitis is not adequately treated
- Furuncles: Perifollicular nodules may appear with progression
- Carbuncles: Multiple coalescing furuncles forming a deep-seated, communicating, pustulating plaque with potential systemic symptoms 1
Important Clinical Pitfall
A critical diagnostic consideration is that beard area infections with this appearance should not automatically be assumed to be solely staphylococcal. If there is:
- History of close animal contact
- Lack of response to antibiotic treatment
Then tinea barbae (fungal kerion) must be considered and investigated 1. This distinction is crucial because surgical intervention (incision and drainage) would worsen a fungal kerion, which requires antifungal agents and often systemic steroids rather than antibiotics.
Distinction from Other Forms of Impetigo
Bockhart's impetigo differs fundamentally from the two main types of impetigo described in guidelines:
- Nonbullous impetigo (70% of cases): Honey-colored crusts on erythematous base, caused by S. aureus and/or β-hemolytic streptococci 2
- Bullous impetigo (30% of cases): Large, flaccid bullae caused by toxin-producing S. aureus strains that cleave the dermal-epidermal junction 2, 3
Bockhart's impetigo is a follicular infection rather than an epidermal infection, making it a separate clinical presentation within the spectrum of staphylococcal skin infections.