Leviticus 13:3-4 ▼

3 And the priest shall look on the disease on the skin of his body; and if the hair in the sore is turned white and the appearance of the plague is deeper than the skin of his body, it is a plague of leprosy; and the priest shall look on it and pronounce him unclean.

4 And if the shiny spot be white on the skin of his body, but does not appear to be deeper than the skin, and the hair in it has not turned white; then the priest shall observe the disease for seven days;