Her husband wants her to remove the hair from her arms and legs
Question

                One of the Sunnahs of the fitrah is to remove the armpit hair and pubic hair. Can a woman remove hair from the arms and legs, knowing that this is difficult for the woman? If the husband asks his wife to do that and she refuses because of the pain it causes her and because it takes too much time, what is the Islamic view on that? Is it permissible for her to do that by going to a salon?.
Praise be to Allah.
    Firstly: the hair on the arms and legs is something about 
    which sharee’ah does not say anything. If sharee’ah does not say anything 
    about a matter, it is allowable. It does not come under the same heading as 
    the hair which we are commanded or recommended to remove, and it does not 
    come under the heading of the hair which we commanded to leave alone – such 
    as the hair on a woman’s head and the eyebrows. 

    Because sharee’ah does not say anything about it, the 
    scholars differed concerning it. Some of them said that it is not 
    permissible to remove it, because removing it is changing the creation of 
    Allaah, and Allaah tells us that the Shaytaan said: 

    “ ‘and indeed I will order them to change the nature 
    created by Allaah’”

    [al-Nisa’ 4:119 – interpretation of the meaning]

    Others said that it is permissible to remove it because it is 
    one of the things concerning which sharee’ah did not say anything, so the 
    ruling is that it is permissible, since whatever sharee’ah did not say 
    anything about in the Qur’aan or Sunnah is allowable, as it says in the 
    hadeeth: “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 whatever 
    He has not said anything about is allowable.” Narrated by al-Tirmidhi, 1726; 
    classed as hasan by al-Albaani in Saheeh al-Tirmidhi. 

    The view that it is permitted is the view favoured by the 
    Standing Committee, and also by Shaykh Ibn ‘Uthaymeen. See Fataawa 
    al-Mar’ah al-Muslimah, 3/879; Majmoo’ Fataawa Ibn ‘Uthaymeen, 11/q. 64. 

    See also questions no.
    9037,
    742,
    451. 

    Secondly: It is mustahabb for husband and wife to make 
    themselves look good for one another, because Allaah says (interpretation of 
    the meaning): 

    “and live with them honourably”

    [al-Nisa’ 4:19] 

    “And they (women) have rights similar (to those of their 
    husbands) over them to what is reasonable”

    [al-Baqarah 2:228]
It is customary for 
    spouses to make themselves look good for one another. If the husband tells 
    his wife to make herself look good for him, then it becomes obligatory for 
    her to do so, because that is his right and because obeying the husband in 
    that which is good and proper is obligatory for her. Al-Mawsoo’ah 
    al-Fiqhiyyah, maadat al-tazayyun, 11/271. 

    Based on this, if the husband tells his wife to remove the 
    hair on her arms and legs, and that will not cause her any harm or involve 
    her doing something haraam, then it is obligatory for her to do that. The 
    husband should forego his right to ask his wife to do that if she convinces 
    him that this causes her hardship or she does not want to do it and so on. 

    Thirdly: with regard to going to a salon to do this, there is 
    nothing wrong with that, so long as the following conditions are met: 

    1-That should be done by a woman, 
    with no men present. The place should also be one where the people can be 
    trusted, especially nowadays when cameras etc are readily available and many 
    people are corrupt.

    2-The women should not see any 
    part of her ‘awrah such as the thighs. It should be limited only to the arms 
    and lower legs as Shaykh al-‘Uthaymeen said (al-Liqa’ al-Shahri, q. 
    278)

    3-The salon should not be a place 
    where ‘awrahs are uncovered. The scholars have stated that it is haraam for 
    a woman to enter public baths because they are places where ‘awrahs are 
    uncovered. Al-Albaani (may Allaah have mercy on him) said: The public baths 
    are definitely haraam for women. It was narrated that Abu Maleeh said: Some 
    women from Syria entered upon ‘Aa’ishah (may Allaah be pleased with her) and 
    she said: “Who are you?” They said: “From the people of Syria.” She said: 
    “Perhaps you are from al-Koorah where women enter the public baths?” They 
    said: “Yes.” She said: “I heard the Prophet  (peace and blessings of 
    Allaah be upon him) say: ‘There is no woman who takes off her clothes 
    anywhere but in her own house, but she has torn (the veil of modesty) 
    between her and Allaah.’” Narrated by the authors of the four Sunans, 
    and its isnaad is saheeh according to the conditions of al-Saheehayn.
    Tamaam al-Minnah 130).
And Allaah knows 
    best.