Commentaries:
Jamieson, Fausset, and Brown
the leper in whom the plague is, his clothes shall be rent, etc.—The person who was declared affected with the leprosy forthwith exhibited all the tokens of suffering from a heavy calamity. Rending garments and uncovering the head were common signs of mourning. As to "the putting a covering upon the upper lip," that means either wearing a moustache, as the Hebrews used to shave the upper lip [CALMET], or simply keeping a hand over it. All these external marks of grief were intended to proclaim, in addition to his own exclamation "Unclean!" that the person was a leper, whose company every one must shun.
Other Jamieson, Fausset, and Brown entries containing Leviticus 13:45:
Numbers 5:2
2 Samuel 19:24-30
Song of Solomon 4:3
Ezekiel 24:17
Micah 3:7
Luke 17:12
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