Leviticus 13:32

And on the seventh day the priest shall view the touch; and if the scald hath not spread, and there be no yellowish hair in it, and the appearance of the scald is not deeper than the skin;

And the priest shall look at the plague on the seventh day; and, behold, if the scurf be not spread, and there be no yellowish hair on it, and the appearance of the scurf is not hollow under the skin;