Praise be to Allaah.
Hair is of three types:
1 – That which sharee’ah commands us to leave alone and forbids us to remove any of it.
2 – That which sharee’ah commands us to remove.
3 – That concerning which sharee’ah says nothing; it does not tell us to remove it or forbid us to do so.
That which sharee’ah commands us to leave alone is the beard and eyebrows, from which nothing should be removed.
That which we are commanded to remove is armpit hair and pubic hair, and the moustache in the case of men.
That concerning which sharee’ah says nothing is forgivable (and is the matter of personal choice), because the Prophet (peace and blessings of Allaah be upon him) said: “What is halaal is that which Allaah has permitted in His Book, and what is haraam is that which Allaah has forbidden in His Book, and what He has remained silent about is forgivable.” Narrated by al-Tirmidhi, 1726; classed as hasan by al-Albaani in Saheeh al-Tirmidhi.
That includes hair in the nose, on the chest, and on the legs and arms.
It says in al-Mawsoo’ah al-Fiqhiyyah (18/100):
With regard to shaving body hair in the case of a man, it is permissible according to the Maalikis, and it was said that it is Sunnah. What is meant by the body is everything except the head.
And Allaah knows best.