The patches are a different colour from the rest of the skin and they have no feeling if they are touched.
Weak/paralysed muscles in the hand can cause the fingers to claw; it can also mean that the foot can't be lifted up. Oftentimes, weakness of the muscle around the eye also means that the eye cannot be closed.
Some people experience reactions to the leprosy bacteria in their body, even when the bacteria are dead/have been treated and treatment is underway or completed.
These reactions can cause pain, sickness, swelling of the skin and fever. They are hard to treat, making it necessary for people to stay in the hospital for a long time.