Why is there a bump above my eyebrows after Botox? (Photos)

Bruising after Botox or filler injections may occur and usually resolves over few days. If it persists you should follow up with your surgeon for evaluation. 

This could either represent a bruise from the injection or uneven Botox distribution resulting some of the frontalis muscle still contracting. I would give this a few days to resolve. If it is a bruise, it will resolve on its own. If it's because of uneven Botox distribution, then you may need to followup with your injector for a few extra units of Botox.

You need to see your treating physician and they can easily rectify the situation with a small amount of additional Botox. Good luck from New York City

Since the "bump" appears only with expression and is undetectable at rest, it could be related to not uniform distribution of Botox. In general, Botox injection in one group of muscles does not necessarily only weakens it but it may evoke a response in the opposing muscle, a phenomenon used on face sculpting with Botox. The same mechanism exists within one single muscle of which your forehead muscle is a prime candidate. You weaken only one part of the muscle but the "untouched" part of the muscle may try to compensate that partial weakness "on behalf" of the entire muscle. With for 10-12 days and if it persists, consult your injector for possible correction. Good luck!

It is just an accumulation of fluid or blood under the skin and sill go away in a few days and it is nothing to be concerned about

Thanks for the question.  My guess is that it is a small bruise and should go away in a few days without any treatment on your part.  If it is still there in a week, I would be surprised and tell you to call your provider.