Leviticus 13:42

But if a white reddish mole was formed upon the bald place before or behind, it was leprosy breaking out upon it, and was to be recognised by the fact that the rising of the mole had the appearance of leprosy on the skin of the body. In that case the person was unclean, and to be pronounced so by the priest. "On his head is his plague of leprosy," i.e., he has it in his head.

The next ceremonial uncleanness is that of the leprosy, concerning which the law was very large and particular; we have the discovery of it in this chapter, and the cleansing of the leper in the next. Scarcely any one thing in all the levitical law takes up so much room as this. I. Rules are here given by which the priest must judge whether the man had the leprosy or no, according as the symptom was that appeared. 1. If it was a swelling, a scab, or a bright spot (v. 1-17). 2. If it was a bile (Lev 13:18-23). 3. If it was in inflammation (Lev 13:24-28). 4. If it was in the head or beard (Lev 13:29-37). 5. If it was a bright spot (Lev 13:38, Lev 13:39). 6. If it was in a bald head (Lev 13:40-44). II. Direction is given how the leper must be disposed of (Lev 13:45, Lev 13:46). III. Concerning the leprosy in garments (Lev 13:47, etc.).

13:42 A reddish white sore perhaps indicated pus and inflammation.