Asymmetry

I’ve been getting Botox for migraines by a neurologist for 2 years, it has completely eradicated my migraines so I’m so grateful!

However this happened… totally fine when resting but if I make an “oh wow” expression my right brow pulls up. Doesn’t really look like a Spock brow and it’s never happened before

What is the underlying issue? There is no difference to my eyelids. Ive never even cared if there was possibility of having a dropped brow as long as they were both dropped. It’s not cosmetic Botox it’s medical. So medicare covers it, and it has changed my life.. but this … what is this lol

What can be done if this is going to happen regularly now, I can’t go back to him to try balance it out as it’s not what he does.. he just treats the migraines