Levítico 13:20

20 The priest is to examine it, and if it appears to be more than skin deep and the hair in it has turned white, the priest shall pronounce that person unclean. It is a defiling skin disease that has broken out where the boil was.

20 And after looking at it, if it seems to go deeper than the skin, and the hair on it is turned white, then the priest will say that the man is unclean: it is the leper's disease, it has come out in the bad place.