Leviticus 13:39

then the priest shall examine them. 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.

Then the priest shall look: and, behold, if the bright spots in the skin of their flesh be darkish white; it is a freckled spot that groweth in the skin; he is clean.