Leprosy is an infectious bacterial decease.
Mainly effects the skin and nerves outside of the brain and spinal cord. The main symptoms are skin sores, lumps, or bumps that do not go away after several weeks or months. Leprosy can also lead to loss in feeling in the arms and legs, which can be bad. It can become lethal if left untreated.
Leprosy can be cured. Usually, antibiotics are used to treat the infection. In some cases, two or more antibiotics are needed to cure the patient. However, the nerve damage is not cured by the antibiotics. For the nerve pain and damage, patients must take anti-inflammatory drugs need to be taken.
As seen here, Leprosy is more prominent in areas with less hygiene and poorer places.