Upon the blood — Upon the place where that blood was put.
Related Commentaries of Leviticus 14:17
Leviticus 14:17
17 And of the rest of the oil that is in his hand shall the priest put upon the tip of the right ear of him that is to be cleansed, and upon the thumb of his right hand, and upon the great toe of his right foot, upon the blood of the trespass offering: