'Spots' in the Bible

"When a man or a woman has bright spots in the skin of the body, even white bright spots;

then the priest shall examine them; and behold, if the bright spots on the skin of their body are a dull white, it is a harmless rash, it has broken out in the skin; he is clean.

Can the Ethiopian change his skin, or the leopard his spots? then may you also do good, who are accustomed to do evil.