Leviticus 13:20-22

Living Bible

²⁰ If the priest sees that the trouble seems to be down under the skin, and if the hair at the spot has turned white, then the priest shall declare him defiled, for leprosy has broken out from the boil. ²¹ But if the priest sees that there are no white hairs in this spot, and the spot does not appear to be deeper than the skin, and if the color is gray, then the priest shall quarantine him for seven days. ²² If during that time the spot spreads, the priest must declare him a leper.