Chronic infectious disease caused by the acid-fast bacteria Mycobacterium leprae , characterized by skin lesion(s) and involvement of peripheral nerves.
Skin lesions can be erythematous or hypopigmented, single or multiple macules, papules, or nodules, sometimes with loss of sensation.
Skin smear may or may not be positive for acid-fast bacilli (AFB) depending on the classification (multibacillary vs. paucibacillary).
Nerve damage to peripheral nerve trunks may occur, with loss of sensation in the skin and weakness of muscles supplied by the affected nerve, leading to disabilities.
Diagnosis is most commonly based on clinical signs and symptoms, and in practice, people usually report on their own to the health center.
The standard WHO-recommended treatment for leprosy is with multidrug therapy (MDT).
Leprosy (also know as Hansen disease) is a chronic infectious disease characterized by one or more of the following features: hypopigmented or erythematous skin lesion(s) with loss of sensation; involvement of the peripheral nerves, as demonstrated by loss of sensation, paresthesias (tingling of hands and feet), and weakness of the muscles of hands, feet, or face. 
Associate Clinical Professor
USC Keck School of Medicine
Department of Dermatology
MTO declares that she has no competing interests.
Dr Maria T. Ochoa would like to gratefully acknowledge Dr Denis Paul Jacques Daumerie, a previous contributor to this monograph. DPJD declares that he has no competing interests.
Member of World Health Organization Panel of Experts on Leprosy
HS declares that he has no competing interests.
National Hansen's Disease Programs
DMS declares that he has no competing interests.
Leprosy and Neglected Tropical Diseases in Central Africa Countries
World Health Organization
Country Office of Kinshasa
DR of Congo
AT declares that he has no competing interests.
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