The kohen is to examine him on the seventh day. If it has spread in the skin, then the kohen is to pronounce him unclean. It is the plague of tza'arat.
then the kohen is to examine the plague, and behold, if its appearance is deeper than the skin, and the hair in it is yellow and thin, then the kohen is to pronounce him unclean. It is a scab—tza'arat of the head or the chin.
On the seventh day, the kohen is to examine the scab, and behold, if the scab has not spread in the skin and its appearance is no deeper than the skin, then the kohen shall pronounce him clean. He is to wash his clothes, and be clean.