Negative commandment · Lo Ta’aseh #307 of 613
Not to shave the hair around a bald spot brought about by tzara’at]
שלא לגלח שיער הנתק
The verse · Vayikra 13:33
וְהִתְגַּלָּח וְאֶת־הַנֶּתֶק לֹא יְגַלֵּחַ וְהִסְגִּיר הַכֹּהֵן אֶת־הַנֶּתֶק שִׁבְעַת יָמִים שֵׁנִית
“he shall be shaved, but the patch shall not be shaved; and the priest shall shut up him that has the patch seven days more:”
The Rambam’s words
Not to shave the hair around a bald spot brought about by tzara’at], as [Leviticus 13:33] states: "And he shall not shave the bald spot."
שלא לגלח שיער הנתק, שנאמר "ואת הנתק, לא יגלח" (ויקרא יג,לג).
Why · Sefer HaChinuch #170
To not shave the hair of the scab
“It is from the roots of the commandment to hint that every person should tolerate whatever pain and whatever punishment G-d, blessed be He, punishes him and not rebel against them.”
Who & when
“And it is practiced by males and females in every place and at all times that there is a priest that has the wisdom to [recognize these] ailments.”
Where in the Mishneh Torah
Hilchot Defilement by Leprosy הלכות טומאת צרעת