Drying the face:<a href="#_ftn1" name="_ftnref1">[1]</a> [One must dry his face well after washing<a href="#_ftn2" name="_ftnref2">[2]</a> as] not drying it well can lead to cracks in his skin or to boils. If one did not do so then his cure is to wash his face many times in water that had beets/spinach<a href="#_ftn3" name="_ftnref3">[3]</a> [cooked<a href="#_ftn4" name="_ftnref4">[4]</a>] in it.
<a href="#_ftnref1" name="_ftn1">[1]</a> Admur Kama 4:20; Michaber 4:20; Shabbos 133b; See Sefer Shemiras Haguf Vihanefesh [Lerner] 54:25
<a href="#_ftnref2" name="_ftn2">[2]</a> Ketzos Hashulchan 2:10
<a href="#_ftnref3" name="_ftn3">[3]</a> Lit. Tradin. This is also called silka as mentioned in Hilchos Rosh Hashana 583. It is defined as either spinach or beets. Vetzaruch Iyun.
<a href="#_ftnref4" name="_ftn4">[4]</a> So is implied from Rashi Berachos 39a “Meiy Silka”

Shulchan Aruch HaRav | 📄 Drying the face after washing it in the morning

Drying the face:[1] as] not drying it well can lead to cracks in his skin or to boils. If one did not do so then his cure is to wash his face many times in water that had beets/spinach[3] [cooked[4]] in it.