Borderline tuberculoid leprosy associated with primary cutaneous histoplasmosis

Area of Science:

• Dermatology
• Infectious Diseases
• Pathology

Background:

• Leprosy, a chronic infectious disease, primarily affects the skin and peripheral nerves.
• Histoplasmosis is a fungal infection caused by Histoplasma capsulatum, often affecting the lungs but can manifest cutaneously.
• Co-infections of leprosy and histoplasmosis are exceedingly rare, posing diagnostic and therapeutic challenges.

Observation:

• A patient presented with persistent skin lesions and arthralgia.
• Initial investigations were inconclusive, necessitating a comprehensive diagnostic workup.
• Skin biopsy revealed features consistent with borderline tuberculoid leprosy and concurrent primary cutaneous histoplasmosis.

Findings:

• Histopathological examination confirmed the presence of Mycobacterium leprae and Histoplasma capsulatum in skin biopsies.
• The patient exhibited a rare co-occurrence of two distinct infectious agents affecting the skin.
• Clinical presentation mimicked other dermatological conditions, underscoring the importance of thorough diagnostic evaluation.

Implications:

• This case highlights the importance of considering uncommon co-infections in patients with complex dermatological presentations.
• Early and accurate diagnosis is crucial for effective management and preventing complications of both leprosy and histoplasmosis.
• Further research into the immunological interactions between leprosy and histoplasmosis may be warranted.