The 307th prohibition is that we are forbidden from shaving the hair of a bald patch.1
The source of this prohibition is G‑d's statement,2 "Do not shave the bald patch."
The Sifri says, "What verse teaches us that one who pulls off signs of tumah from within a bald patch transgresses a Biblical prohibition? The verse, 'Do not shave the bald patch.' "
A bald patch (nesek) renders a person tameh when it spreads or when gold-colored hairs grow within it. In order to tell whether or not it has spread, all the hair surrounding the bald area is shaved except for a border two hairs in width. This ring of hair serves as a mark to indicate whether the nesek has spread further.
Some explain that the Rambam considers this prohibition to be removing the gold hairs. Others hold that the prohibition is to cut off the ring of hair, and that cutting the gold hairs is covered by N308. See Kapach, 5731, note 84. Kapach, 5718, note 487. Yad HaLevi, note 1.
Lev. 13:33.
