Rashi on Leviticus 13:4/רש"י על ויקרא י״ג:ד׳

1ועמק אין מראה AND ITS APPEARANCE BE NOT DEEPER [THAN THE SKIN] — I do not know the meaning of this.

2והסגיר HE SHALL SHUT [HIM UP] — He shall shut him up in one house and shall not see him again until the end of the week. Then the symptom that show themselves shall decide regarding him whether he is unclean or not.