John Gill Commentary Leviticus 13:42

"But if there be in the bald head, or the bald forehead, a reddish-white plague; it is leprosy breaking out in his bald head, or his bald forehead." — Leviticus 13:42 (ASV)

And if there be
Or, "but if there be", or, "when there shall be" ^F25 , or shall appear to be:

in the bald head, or in the bald forehead, a white reddish sore ;
white and red mixed, as the Targum of Jonathan, having something of both colours, neither a clear white nor thorough red; though, according to Bochart, it should be rendered "a white sore exceeding bright"; (See Gill on Leviticus 13:19);

it [is] a leprosy sprung up in his bald head, or in his bald forehead ;
the signs of which were raw flesh and spreading; so it is said in the Misnah ^F26 ,``those two sorts of baldness defile in two weeks, by two signs, by quick raw flesh and by spreading;''

if there was the bright spot and no quick flesh, then he was to be shut up seven days, and looked upon at the end of them; and if there was either quick flesh or a spreading, he was pronounced unclean, but if neither, he was shut up seven days more; and if either of the above signs appeared he was pronounced unclean, if not he was set free.

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FOOTNOTES:

• F25: (ykw) "sin autem", V. L. "quum autem", Junius & Tremellius, Piscator Drusius.
• F26: Ut supra. (Misn. Negaim, c. 10. sect. 10.)