Coexistent leprosy and lupus erythematosus.

Area of Science:

• Immunology
• Dermatology
• Infectious Diseases

Background:

• Lupus erythematosus is a chronic autoimmune disease often managed with immunosuppressive therapy.
• Corticosteroids are commonly used systemic agents for lupus erythematosus.
• Leprosy (Hansen's disease) is a chronic infectious disease primarily affecting the skin and peripheral nerves.

Observation:

• A patient with lupus erythematosus on systemic corticosteroid therapy developed characteristic skin lesions of leprosy.
• The lesions were noted on the elbow and knee.
• The patient experienced sensory loss associated with the cutaneous manifestations.

Findings:

• The emergence of leprosy lesions coincided with corticosteroid treatment for lupus erythematosus.
• Systemic corticosteroids may have contributed to the development or unmasking of leprosy in this patient.
• This case highlights a potential interaction between immunosuppressive therapy and infectious disease.

Implications:

• Leprosy should be considered in the differential diagnosis of unexplained cutaneous lesions, especially in patients on immunosuppressants.
• Prompt diagnosis of leprosy is essential for effective treatment and prevention of complications.
• Understanding potential iatrogenic triggers for infectious diseases like leprosy is important for clinical practice.