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Overview

What Is Leprosy?

Leprosy is a bacterial disease that mainly affects the skin and peripheral nerves, the nerves outside the brain and spinal cord. It can also affect the eyes and the lining of the nose. The usual signs include skin patches with reduced sensation, numbness, or weakness. Early diagnosis and multidrug treatment can cure the infection and help prevent lasting disability.

Symptoms

Leprosy Symptoms

  • A lighter, reddish, or copper-colored skin patch may have reduced sensation (sensory loss).
  • Numbness may affect the hands, feet, arms, legs, or another area of skin.
  • A peripheral nerve may become thickened or tender.
  • Muscle weakness may affect the hands, feet, face, or eyelids.
  • A painless wound or burn may develop on numb skin.
  • Eye dryness or reduced blinking may occur when facial nerves are affected.

When symptoms matter

Persistent skin changes need evaluation

A persistent skin patch with reduced sensation, especially when accompanied by numbness or weakness, deserves medical assessment. Do not try to diagnose leprosy from appearance alone because several skin and nerve conditions can look similar.

How It Spreads

How Does Leprosy Spread?

Leprosy transmission is thought to occur mainly through repeated, prolonged close exposure to a person with untreated disease, likely through respiratory droplets. A handshake, brief visit, or sitting near someone is not a typical route of spread. Once effective treatment begins, the risk of transmission generally falls greatly.

SituationWhat it means for risk
Repeated, prolonged close exposure to untreated leprosyMay involve meaningful risk, particularly in a household or similarly close setting.
A brief handshake or casual conversationGenerally does not spread leprosy.
Sitting nearby briefly or sharing ordinary public spacesGenerally does not represent the type of exposure associated with transmission.
Handling a wild armadillo in an area where animal transmission occursMay be relevant in certain parts of the Americas; risk varies by location and exposure.

Risk Factors

Leprosy Risk Factors

  • Prolonged close contact with a person who has untreated leprosy may increase the chance of infection.
  • Living in or traveling to an area where leprosy is more common may increase exposure opportunity.
  • Contact with wild armadillos may be a risk factor in regions where they can carry the bacteria.
  • Some health conditions or medicines that impair the immune response may increase susceptibility.
  • A person’s biological susceptibility can affect risk and is not something they can control.
  • Most people who are exposed to leprosy do not develop the disease.

Complications

Leprosy Complications

  • Permanent nerve damage can cause lasting numbness or loss of sensation.
  • Nerve injury can lead to muscle weakness or loss of hand, foot, or facial function.
  • Numb areas can develop painless injuries, burns, or ulcers.
  • Muscle and nerve damage can cause contractures or deformity of the hands, feet, or face.
  • Eye dryness, reduced blinking, or other eye problems can threaten vision.
  • Visible changes, disability, or fear of stigma can cause social and emotional distress.

Protect affected areas

Numbness can hide serious injuries

Check numb skin, hands, and feet each day for cuts, burns, pressure areas, or wounds that may not hurt. Protect these areas from heat and injury, and seek prompt care for any wound or sign of infection.

Diagnosis

How Is Leprosy Diagnosed?

Clinicians assess skin changes, sensation, peripheral nerves, muscle strength, and eye function. They also ask about close contacts, travel, residence, and possible animal exposure. These findings help distinguish leprosy from other causes of skin patches, numbness, or weakness.

A skin smear, skin biopsy, or another laboratory test may be used to identify the bacteria or support the diagnosis. Testing availability varies by location, and the diagnosis may still rely heavily on the examination and characteristic nerve or skin findings.

Treatment & Management

Leprosy Treatment and Management

Leprosy is treated with a combination of antibiotics, known as multidrug therapy. Treatment is usually prescribed for a course lasting months, with the exact medicines and duration based on disease classification and local guidance. Completing the prescribed course helps cure the infection and reduce the risk of ongoing transmission and complications.

Treatment adherence

Complete treatment and follow-up

Take medicines exactly as prescribed and attend follow-up visits. Report new numbness, weakness, eye symptoms, or worsening inflammation promptly, because nerve inflammation may need additional treatment; wounds, numb areas, and affected eyes may also require specialist care.

Prevention

Leprosy Prevention

  • Prompt diagnosis and complete treatment can reduce complications and further spread.
  • Household and other close contacts should be evaluated according to local public-health guidance.
  • Eligible contacts may be offered preventive rifampicin after clinical assessment and appropriate screening.
  • Avoid handling wild armadillos, especially in regions where they may carry the bacteria.
  • Protect numb skin from burns, cuts, pressure, and other injuries.

Outlook and Prognosis

Leprosy Outlook and Prognosis

Appropriate antibiotic treatment can cure leprosy and stop further spread. Recovery depends on how early treatment begins and whether nerve damage is already present. Treatment can clear the infection, but established nerve damage may recover slowly, incompletely, or require ongoing support.

When Should You See a Doctor

When Should You See a Doctor?

  • Arrange medical care for a persistent numb or discolored skin patch.
  • Seek evaluation for new weakness in the hands, feet, face, or another body area.
  • Ask for medical assessment if a nerve feels thickened or painful.
  • Get prompt care for a painless wound, ulcer, burn, or other injury on numb skin.
  • Seek care for eye dryness, reduced blinking, vision changes, or eye pain.
  • Contact a clinician after prolonged close contact with someone who has untreated leprosy.

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Symptoms

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