Leviticus 13:3 - Matthew Poole's English Annotations on the Holy Bible

On the plague, i.e. the sign or appearance of the plague of leprosy. And it is observable, that the same signs of it are given by Moses here, and by the learned physicians in their works. And when the leprosy came to its height, not the hair only, but also the skin was turned white, as Exodus 4:6 Numbers 12:10. And this change of colour was an evidence both of the abundance of excrementitious humours, and of the weakness of nature, as we see in old and sick persons. Deeper than the skin; for the leprosy did consume both the skin and the flesh, as appears from 2 Kings 5:14. Pronounce him unclean, Heb. make him unclean, i. e ministerially and declaratively, in which sense ministers are said to remit sins, Matthew 16:19, and to destroy nations, Jeremiah 1:10.