I've had painful shots and other things go wrong like shaking to much during injection and it wasn't that bad but now it's not even that painful and its red and just the red area is swelled and hot to touch hurts like a bruise and at the actually injection site where the needle actually went in its a little yellow as if bruised or could it be worse i did everything like I normally do and it was fine until I noticed this today, is it infected how do I tell for sure and if it is what do I do and how should I go about it .... Help please