All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.
Botox (the Botulinum Toxin Type A) which is a treatment to remove the wrinkles of the face falls under one of the two following categories:
1- If these wrinkles are due to an advanced age and the like, then this operation is not permissible as it is changing Allaah's Creation. Allaah Says about the devil (what means): {…and indeed I (Satan) will order them to change the nature created by Allaah...}[Quran 4:119]. So, if this is the case, it is not permissible to undergo such a medical treatment. This matter is even more forbidden if it is intended to cheat and deceive in order to marry for instance.
2- If these wrinkles are due to a disease and the like, and they are a deformation to Allaah's Creation, then it is permissible to remove such wrinkles, Allaah willing, provided the used method is not harmful to the body, and this could be known by referring to the trustworthy doctors in the field.
Allaah Knows best.