From natural causes was uncommon (2 Kings 2:23; Isaiah 3:24). It was included apparently under "scab" and "scurf," which disqualified for the priesthood (Leviticus 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 (Isaiah 22:12; Jeremiah 7:29; 16:6); it also marked the conclusion of a Nazarite's vow (Acts 18:18; 21:24; Numbers 6:9). It is often alluded to (Micah 1:16; Amos 8:10; Jeremiah 47:5). The Jews were forbidden to follow the customs of surrounding nations in making themselves bald (Deuteronomy 14:1).
These dictionary topics are from M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition, published by Thomas Nelson, 1897. Public Domain, copy freely.
Easton, Matthew George. "Entry for 'Baldness'". "Easton's Bible Dictionary".