Baldness

from natural causes was uncommon (2 Kings 2:23; Isa. 3:24). It
was included apparently under "scab" and "scurf," which
disqualified for the priesthood (Lev. 21:20). The Egyptians were
rarely subject to it. This probably arose from their custom of
constantly shaving the head, only allowing the hair to grow as a
sign of mourning. With the Jews artificial baldness was a sign
of mourning (Isa. 22:12; Jer. 7:29; 16:6); it also marked the
conclusion of a Nazarite's vow (Acts 18:18; 21:24; Num. 6:9). It
is often alluded to (Micah 1:16; Amos 8:10; Jer. 47:5). The Jews
were forbidden to follow the customs of surrounding nations in
making themselves bald (Deut. 14:1).