While traveling along the border of Samaria, Jesus met a group of people suffering from leprosy and miraculously healed them. One of the men, a Samaritan, returned and thanked Jesus for healing him:
When he saw them, he said, "Go, show yourselves to the priests." And as they went, they were cleansed.
One of them, when he saw he was healed, came back, praising God in a loud voice. He threw himself at Jesus' feet and thanked him-and he was a Samaritan.
Jesus asked, "Were not all ten cleansed? Where are the other nine? Has no one returned to give praise to God except this foreigner?" Then he said to him, "Rise and go; your faith has made you well."
-Luke 17:11-19, NIV translation.
The Greek word that often is translated into English as leprosy was used to refer to a variety of diseases that affected a person's skin.
Samaria was a part of the Biblical land of Israel but was inhabited largely by people known as the Samaritans.
Read more in the book Jesus the Miracle Worker: The 50 miracles of Jesus explained in chronological order (The Jesus Series) -- now available at amazon.