Leprosy was believed to be God’s chastisement for sins that were committed by the person. That type of thinking removed compassion and sympathy for the leper. They were likely to be stoned, if they got too close.
Matthew 8:1-4, Mark 1:40-45, Luke 5:12-16
Leper, Jesus Heals Lepers, Make Me Clean, Be Thou Clean, Jesus Touched Him, Desert Places