12 “If the disease breaks out all over their skin and, so far as the priest can see, it covers all the skin of the affected person from head to foot,

Read Leviticus 13:12 Using Other Translations

And if a leprosy break out abroad in the skin, and the leprosy cover all the skin of him that hath the plague from his head even to his foot, wheresoever the priest looketh;
And if the leprous disease breaks out in the skin, so that the leprous disease covers all the skin of the diseased person from head to foot, so far as the priest can see,
“Now suppose the disease has spread all over the person’s skin, covering the body from head to foot.