You should have slapped that person for not adding a touch of diesel to that shot.
Shouldn't be a problem. I got some really good workouts by working the bodypart after it was injected. The volume of the injection plus the blood you pump into it will help stretch the fascia better.
Unless of course you are reacting to the shot and feeling like shit. Then I would skip it and just head to the steamroom to get my dick sucked.