Mycobacterium leprae is a bacterium that causes uncleanliness, otherwise called "Hansen's illness", which is an incessant irresistible infection that harms the fringe nerves and focuses on the skin, eyes, nose, and muscles. Infection can happen at all ages from earliest stages to older, yet is reparable in which medicines can turn away inabilities. It was found in 1873 by the Norwegian doctor Gerhard Armauer Hansen, who was looking for the microorganisms in the skin knobs of patients with disease. It was the principal bacterium to be recognized as causing sickness in people. It is an intracellular, pleomorphic, corrosive quick, pathogenic bacterium. M. leprae is an oxygen consuming bacillus (pole formed bacterium) with equal sides and round finishes, encompassed by the trademark waxy covering special to mycobacteria. Fit as a fiddle, it intently looks like Mycobacterium tuberculosis. This bacterium regularly happens in huge numbers inside the sores of lepromatous sickness that are normally assembled like groups of stogies or masterminded in a palisade. Because of its thick waxy covering, M. leprae stains with a carbol fuchsin as opposed to with the customary Gram stain. The way of life takes half a month to develop.