Behold, it be in sight lower than the skin. — Better, Behold, its appearance is lower than the other skin. If upon examination the priest finds that the spot has assumed a deeper appearance than the rest of the skin, and the hair turned white — which were the two critical symptoms — he forthwith declared it leprosy.
Related Commentaries of Leviticus 13:20
Leviticus 13:20
20 And if, when the priest seeth it, behold, it be in sight lower than the skin, and the hair thereof be turned white; the priest shall pronounce him unclean: it is a plague of leprosy broken out of the boil.