Rashi on Leviticus 13:2/רש"י על ויקרא י״ג:ב׳

1'שאת או ספחת וגו‎ — These are the names of leprous plagues — A RISING, A SCAB etc., — and they are the one whiter than the other (cf. Shevuot 5b; Sifra, Tazria Parashat Nega'im, Section 1 4).

2בהרת means SPOTS, taie in O. F. — Similar is (Job 37:21) “It is a spot (בהיר) in the skies”.

3'אל אהרון וגו‎ [HE SHALL BE BROUGHT] TO AARON etc. — It is an enactment of Scripture that the uncleanness and purification of leprous plagues are pronounced only by the mouth of a priest (Sifra, Tazria Parashat Nega'im, Section 1 9).