And the plague spread not - Rather, advance not, so as to show that the disease is under the cuticle and assuming the symptoms of Leviticus 13:3.
Related Commentaries of Leviticus 13:5
Leviticus 13:5
5 And the priest shall look on him the seventh day: and, behold, if the plague in his sight be at a stay, and the plague spread not in the skin; then the priest shall shut him up seven days more: