29 "If anyone, either a man or woman, has a sore on the head or chin, 30 the priest must examine it. If he finds it is more than skin-deep and has fine yellow hair on it, the priest must pronounce the person ceremonially unclean. It is a scabby sore of the head or chin. 31 If the priest examines the scabby sore and finds that it is only skin-deep but there is no black hair on it, he must quarantine the person for seven days. 32 On the seventh day the priest must examine the sore again. If he finds that the scabby sore has not spread, and there is no yellow hair on it, and it appears to be only skin-deep, 33 the person must shave off all hair except the hair on the affected area. Then the priest must quarantine the person for another seven days. 34 On the seventh day he will examine the sore again. If it has not spread and appears to be no more than skin-deep, the priest will pronounce the person ceremonially clean. The person's clothing must be washed, and the person will be ceremonially clean. 35 But if the scabby sore begins to spread after the person is pronounced clean, 36 the priest must do another examination. If he finds that the sore has spread, the priest does not need to look for yellow hair. The infected person is ceremonially unclean. 37 But if the color of the scabby sore does not change and black hair has grown on it, it has healed. The priest will then pronounce the person ceremonially clean.
Matthew Henry's Commentary on Leviticus 13:29-37
Commentary on Leviticus 13:18-44
(Read Leviticus 13:18-44)
The priest is told what judgment to make, if there were any appearance of a leprosy in old sores; and such is the danger of those who having escaped the pollutions of the world are again entangled therein. Or, in a burn by accident, verse 24. The burning of strife and contention often occasions the rising and breaking out of that corruption, which proves that men are unclean. Human life lies exposed to many grievances. With what troops of diseases are we beset on every side; and thy all entered by sin! If the constitution be healthy, and the body lively and easy, we are bound to glorify God with our bodies. Particular note was taken of the leprosy, if in the head. If the leprosy of sin has seized the head; if the judgment be corrupted, and wicked principles, which support wicked practices, are embraced, it is utter uncleanness, from which few are cleansed. Soundness in the faith keeps leprosy from the head.