Boyd’s Bible Dictionary:

(ball-like). Priests forbidden to make themselves bald (Lev. 21:5; Deut. 14:1; Ezek. 44:20). “Bald-head” a cry of contempt (2 Kings 2:23); as indicating leprosy (Lev. 13:40-43). Voluntary baldness a sign of misery (Isa. 3:24; Ezek. 7:18); or else the conclusion of the Nazarite vow (Num. 6:9).

Concise Bible Dictionary:

The Israelites were forbidden to cut themselves or to make themselves bald for the dead, as the heathen did; for they were a holy people unto the Lord (Lev. 21:5; Deut. 14:1; Jer. 16:6). Baldness is one of the judgments of the Lord: perhaps they would make themselves bald in their distress (Isa. 3:24; Isa. 15:2; Isa. 22:12; Ezek. 7:18; Amos 8:10; Mic. 1:16). See NAZARITE.

“328. Baldness” From Manners and Customs of the Bible:

2 Kings 2:23. 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.
In India the expression “bald-head” has no special reference to a lack of hair, but is often applied to men who have an abundance. It is rather a term of contempt, intended to signify a mean and worthless fellow.
The Hebrews valued a good head of hair and greatly deprecated baldness. See Isaiah 15:2 and note.

“494. Baldness a Sign of Mourning” From Manners and Customs of the Bible:

Isaiah 15:2. On all their heads shall be baldness, and every beard cut off.
To make the head bald, or to shave or pluck the beard, was a sign of mourning among the Hebrews and many other nations. See also Ezra 9:3; Job 1:20; Isaiah 22:12; Jeremiah 7:29; 16:6; 41:5; 47:5; 48:37; Micah 1:16.