Leviticus 13:7-8, 22, 27, 36, 51
Leviticus 13:22 ESV
And if it spreads in the skin, then the priest shall pronounce him unclean; it is a disease.
Leviticus 13:27 ESV
and the priest shall examine him the seventh day. If it is spreading in the skin, then the priest shall pronounce him unclean; it is a case of leprous disease.
Leviticus 13:36 ESV
then the priest shall examine him, and if the itch has spread in the skin, the priest need not seek for the yellow hair; he is unclean.