Peter Pett's Commentary on the Bible
Leviticus 13:18-23
Dealing With Boils/Ulcers (Leviticus 13:18).
“And when the flesh has a boil in its skin, and it is healed, and in the place of the boil there is a white rising, or a bright spot, reddish-white, then it shall be shown to the priest, and the priest shall look; and, behold, if the its appearance be deeper than the skin, and its hair be turned white, then the priest shall pronounce him unclean. It is a suspicious skin disease. It has broken out in the boil.”
If a man has a boil (or ulcer) he also must come to the priest with it. No man must enter the court of the tabernacle with such a boil unless it has been checked. And if the boil has subsided and has been replaced by a white rising or a bright reddish-white spot, and it goes deeper than the skin and the hairs have turned white, the priest must declare him unclean. He has a suspicious skin disease as a result of the boil.
“But if the priest look on it, and, behold, there are no white hairs in it, and it is not deeper than the skin, but is uninflamed, then the priest shall shut him up seven days, if it spread abroad in the skin, then the priest shall pronounce him unclean: it is a suspicious disease. But if the bright spot stay in its place, and be not spread, it is the scar of the boil; and the priest shall pronounce him clean.”
On the other hand if there are no white hairs in it, and it is not deeper than the skin, but appears uninflamed, then the priest must quarantine him for seven days, and if he then finds it has spread abroad he must declare the man unclean, but if there is no spread it is merely the scar of the boil. The man can then be declared clean.
We are all aware how quickly a boil can spring up. One moment we seem to be well and whole, and then suddenly there it is, often a sign that all is not really well with us. And sin springs up just as quickly, and often that too is evidence of even more sin. We must be as quick to take our ‘boils' to the Master, as these men were to take themselves before the priest, for if we do not our boil may become worse, and end in marring our whole lives.