Charles Ellicott Commentary Leviticus 13:25

"then the priest shall look upon it; and, behold, if the hair in the bright spot be turned white, and the appearance thereof be deeper than the skin; it is leprosy, it hath broken out in the burning: and the priest shall pronounce him unclean: it is the plague of leprosy." — Leviticus 13:25 (ASV)

Then the priest shall look. —If upon examination the priest finds that the hair that was previously black has now turned white.

And it be in sight deeper than the skin. —Better, and its appearance is deeper than the other skin. (Leviticus 13:20.)