'Lower' in the Bible

and the priest shall look, and behold, if it appears to be lower than the skin, and the hair on it has turned white, then the priest shall pronounce him unclean; it is the infection of leprosy, it has broken out in the boil.

But if the priest looks at it, and behold, there are no white hairs in it and it is not lower than the skin and is faded, then the priest shall isolate him for seven days;