Leprosy is a chronic infection caused by the bacteria Mycobacterium leprae. It principally affects the skin, nerves, respiratory tract and eyes. Symptoms include numbness, skin lesions and facial disfigurement. People living in areas with poor sanitation and nutrition are at higher risk. The disease is transmitted through droplets or direct contact with untreated patients. Diagnosis involves clinical examination and bacteriological tests. Treatment consists of multidrug therapy along with treatment of complications.