Just thought I add my bit
As someone who has much too much knowledge of needles from a personal point of view as well as the fact that I stick needle in my dog everyday.
I just like to say that the bump can come from the needle itself as well as the vaccines. Itās all too easy to hit a vein going in and a bump will result.
I had vet nurses cause bumps with insulin injections, its just one of them things that can happen.
& sometimes Cassie the cocker AKA 'the black shadow''
~♥Blind Dogs See With Their Hearts♥~
My cavalier not spoilt...I'm just well trained!