When treating chronic daily headache or migraines with Botox, most doctors will use a modified “Follow the Pain” approach. Simply stated, that means if your migraines start out as tension in the middle of your forehead and between the eyes, then these are the areas that will receive some Botox. Treating these areas will also help upper face wrinkles.
However, if your headaches normally start in the occipital area (back of the head) or temporal area (side of the head), then there may not be any clinical justification for putting Botox in those muscles of the upper face.
Due to the fact that these specific muscles (which cause the wrinkles in the upper face) are not being treated, you should not expect to see any improvement in those wrinkles.