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).
Baldness
In the Bible’s world a shaved head was a sign of grief. Isaiah says the Lord called his people “to weeping, and to mourning, and to baldness” (Isaiah 22:12), and Amos hears God say he will bring “baldness upon every head” until the land mourns “as the mourning of an only son” (Amos 8:10). The Law told priests not to “make baldness upon their head” (Leviticus 21:5), and Jeremiah pictures a land so full of dead that no one will “make themselves bald for them” (Jeremiah 16:6). Isaiah 22:12 shows the practice most clearly.
10 verses
Leviticus
They shall not make baldness upon their head, neither shall they shave off the corner of their beard, nor make any cuttings in their flesh.
2 Kings
And he went up from thence unto Bethel: and as he was going up by the way, there came forth little children out of the city, and mocked him, and said unto him, Go up, thou bald head; go up, thou bald head.
Isaiah
And it shall come to pass, that instead of sweet smell there shall be stink; and instead of a girdle a rent; and instead of well set hair baldness; and instead of a stomacher a girding of sackcloth; and burning instead of beauty.
And in that day did the Lord GOD of hosts call to weeping, and to mourning, and to baldness, and to girding with sackcloth:
Jeremiah
Both the great and the small shall die in this land: they shall not be buried, neither shall men lament for them, nor cut themselves, nor make themselves bald for them:
Baldness is come upon Gaza; Ashkelon is cut off with the remnant of their valley: how long wilt thou cut thyself?
For every head shall be bald, and every beard clipped: upon all the hands shall be cuttings, and upon the loins sackcloth.
Ezekiel
And they shall make themselves utterly bald for thee, and gird them with sackcloth, and they shall weep for thee with bitterness of heart and bitter wailing.
Son of man, Nebuchadrezzar king of Babylon caused his army to serve a great service against Tyrus: every head was made bald, and every shoulder was peeled: yet had he no wages, nor his army, for Tyrus, for the service that he had served against it:
Amos
And I will turn your feasts into mourning, and all your songs into lamentation; and I will bring up sackcloth upon all loins, and baldness upon every head; and I will make it as the mourning of an only son, and the end thereof as a bitter day.
From Easton's Bible Dictionary
Matthew George Easton, 1897