Excessive use of Chaos magic is known to cause the morphology of the face to change… [such that] the Magician’s visage grows ever more hideous.
[It is] not surprising then that one of the most frequent uses of Chaos Magic is to alter ones own features so as not to attract unnecessary attention.
Indeed many Magicians use these methods in order to retain their youthful appearance well into their senior years.
Michael Scott Hand 