Must one wash his hands after being honored to cut some hair by an Upshernish? Some[1] write it is not necessary to wash hands afterwards. Others[2] write one is to wash the hands [1] Halichos Shlomo 2:10; Yalkut Hatispores p. 77 by Rav Y.Y. Sarabranski. There he explains that perhaps
Must one wash his hands after being honored to cut some hair by an Upshernish?
Some[1] write it is not necessary to wash hands afterwards. Others[2] write one is to wash the hands
[1] Halichos Shlomo 2:10; Yalkut Hatispores p. 77 by Rav Y.Y. Sarabranski. There he explains that perhaps the cutting of a few locks of hair does not cause the evil spirit to reside.
[2] See Piskeiy Teshuvos 4:28 footnote 265; Rav Avraham Pariz would wash his hands three times inconsecutively after cutting a curl of hair from the three year old boy. [Keitzad Nechaneich Yiladeinu p. 172]