Fiqh-us-Sunnah Volume 5, Hajj and ‘Umrah, Fiqh 5.045B.

Ibn ‘Abbas said: “A person in a state of ihram is permitted to smell sweet basil, look in a mirror, and cure himself by eating butter and oils.” ‘Umar bin Abdul ‘Aziz used to look in the mirror and use the tooth stick (siwak) while in a state of ihram.

Ibn Al-Munzhir said: “There is consensus among the scholars that a muhrim may eat oil, fat, and butter, but he is not permitted to use perfume all over his body.

Hanafi and Maliki scholars hold it is disliked for a muhrim to stay at a place which is full of perfume or scent, whether he intended to smell it or not. Hanbali and Shafi’i schools are of the opinion that if such a person does so intentionally it is unlawful for him, otherwise there is no harm. The Shafi’i school holds that sitting at a perfumer in an incensed place is permissible, because its prohibition will make things difficult. Applying perfume is not desirable; one should avoid it unless one is sitting in a place where one cannot avoid it, for example, if one is sitting in the Sacred Mosque when it is scented. In this there is no harm, nor is it disliked, because sitting at this place is a means of achieving closeness to Allah, and to abandon it for something which is at best only permissible is not desirable. One may carry the perfume in a bottle or wrapped in a cloth and one is not required to make any atonement for doing so.