Leviticus 13:20-22

Amplified Bible

²⁰ and the priest shall look, and if it looks deeper than the skin and the hair on it has turned white, the priest shall pronounce him unclean; it is the disease of leprosy; it has broken out in the boil. ²¹ But if the priest examines it and finds no white hair in it and it is not deeper than the skin and is dull in color, then the priest shall isolate him for seven days. ²² If it spreads farther on the skin, then the priest shall pronounce him unclean; it is a disease.