Primary perforating granulomatous folliculitis--scarring deep type

Area of Science:

• Dermatology
• Pathology

Background:

• Perforating folliculitis is a follicular eruption characterized by papules with a central keratotic plug.
• Histologically, it is classified into superficial and profound types based on the level of follicular wall rupture.
• The profound type involves granulomatous inflammation and destruction of the pilary complex, often linked to systemic conditions like renal disease or diabetes mellitus.

Observation:

• This report focuses on two patients presenting with the profunda type of perforating folliculitis.
• The condition manifested in early adulthood and was characterized by scarring.
• Notably, these patients had no identifiable underlying systemic disorders.

Findings:

• The study highlights the occurrence of the severe, scarring profunda type of perforating folliculitis in adults.
• It demonstrates that this condition can arise without the typical associations of renal disease or diabetes mellitus.
• Histopathological examination confirmed the characteristic follicular wall rupture and granulomatous inflammation.

Implications:

• These cases expand the clinical understanding of perforating folliculitis, particularly the profunda type.
• The findings suggest that perforating folliculitis, even in its severe scarring form, may occur idiopathically in adults.
• Further research may be warranted to explore potential genetic or environmental factors in idiopathic cases.