Muslim narrated that Abu Sai'd Al-Khudri said that the Prophet (peace be upon him) said: "The best type of perfume is Musk."
In the Sahihain it is also narrated that Aishsh (RA) said: "I used to anoint the Prophet (peace be upon him) with perfumed Musk before assuming Ihram, on the Day of the Sacrifice and before performing Tawaf around the (Sacred) House."
Musk is the king of all perfumes, it has the best aroma. Other types of perfumes are usually compared to Musk, but Musk is never compared to them. Also, the hills and sands of Paradise are made of Musk.
Musk is a hot, dry substance of the second degree, and it brings comfort and joy to the hearts and strengthens the inner organs when it is drunk or smelled. Musk also brings strength and comfort to the external organs when anointed with it. Musk is profitable for old people and those who have excessive skin moistures, especially during winter, and also helps against fainting, shaking and the general weakness in the body as it excites the instinctive heat. Musk clears the white part in the eye and dries excess moisture in it, and also dissipates swelling in various organs. Musk also works as an antidote for some poisons, and helps against snakebite. It has many other benefits.
Taken From: Healing with the medicine of the Prophet (peace be upon him), by Imam Ibn Qayyim Al-Jauziyah