What you are seeing can be a natural result of movement remaining in a muscle (such as that below your brow) that was not treated with Botox while the area around it is now smooth from the treatment. This can be remedied if your doctor is comfortable injecting a small dose in that area to smooth it out. For future treatments, I would be sure to remind your doctor of this so that this area is always treated in the future.
Once Botox is used, it can impact the way the muscles not treated will react. This may lead to puckering that was not seen before.