Halakha Imamat 21:5: Mishneh Torah, Foreign Worship and Customs, Shulchan Arukh, Yoreh De'ah & Sefer HaChinukh

One who makes a single incision in his flesh for the dead is striped, for it is said: "And for the dead shall ye not make any incision in your flesh" (Ibid.), regardless of whether a priest or lay-Israelite does it. If one made a single incision for five dead people, or five incisions for a single dead person, he is striped five times, provided warning was given him in each instance.¹⁵Kiddushin, 37b; Makkot, 20a. C.

One who makes himself bald between his eyes for the dead, is striped, for it is said: "Nor make any baldness between your eyes for the dead" (Ibid.). Whether one is a lay-Israelite or a priest if either made himself bald between his eyes over the dead he is striped only once. One who makes himself four or five bald spots over one dead person, is striped according to the number of bald spots he made, provided he received warning before he made⁹ each one of the bald spots. Whether one makes the baldness by hand, or by poison, or whether he dipped his fingers in poison and put them all at one time in five places of his head, seeing that he made five bald spots, although he had but one warning, he is striped, five times, because they all were made simultaneously. One is as guilty in making baldness anywhere on his head as he is when he makes it between his eyes, even as it is said: "They shall not make any baldness upon their head" (Lev. 21.4). What size must the baldness be? So as to make a bald spot, bare without hair, as big as a split grain.¹⁸Kiddushin, 36b; Makkot, 20b–21a. C.

Women are also cautioned against balding. [Comment of Rema: And how much more so against cutting (Tur). And it is right to caution them not to remove their hair by the deceased person, so that they do not come to violation of the prohibition on balding (Tur citing Yerushalmi) and likewise with cutting.]