Thank you for your question. You've pointed out one of the uncommon, but, nevertheless, real effects of Botox treatment. The injection into the area of the crow's feet paralyzed the segment of the muscle that was pulling the eyelid skin upwards. The lower part of the muscle is still active, so as a result, the skin started "bunching up" under the eyelid and the crease begun to appear. There are two ways you can proceed from here. One option is to wait it out. As the Botox begins to wear off the eyelid muscle will regain it's tone and the crease will disappear. The second option is to add more Botox to the lower part of the muscle in order to prevent the skin from forming a crease.
I would recommend discussion pros and cons of each option with your doctor.