Reply To: Shaving Erev shabbos mochor chodesh

Accomodating your hair disease is a Chiyuv miDeOraaisso of “v’Nishmartem Me’od leNafshoseichem”, whereas Availus b’Sefiro is at most a Minhog.

You can study about bold patches in yesterday’s Parshiyos Tazria-Metzoro.