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

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