These things are hard to deal with over a computer because only you can know what is going on. I have had some bad injections in the past, and I think the psychological stress that something might be wrong is the worst part of it. Anyway.
When you said "no bleeding" does this mean that your friend pulled back once he had the needle was in and only clear bubbles came up? Or do you only mean that there was no bleeding after the needle was removed?
You might have nicked a blood vessel, or even went through one. I have a lot of experience with injections, and I can feel when I am in a vessel, or drive through one. (I still pull back on the syringe to check for blood) But if I do hit a vessel, or go through one (on the surface, but inject into muscle) there is a slight swelling at the site. Even if you don't inject into a vessel, but nick or drive through one, there will be clotting. This might be your lump. But agian, only you can prevent forest fires ... I mean, only you can tell how serious it gets.