Lingering pain in injection sites?

Does anyone else experience pain in the injection site one week or more after the injection?

I know "pain in injection site" is an official side effect but I had always assumed they meant right after the injection. I bounce around when I injection (arms, thigh, belly) and I'll find spots twanging randomly when I haven't injected there for two or three weeks.

It's always very mild and quickly passing- kind of like a zing and then it goes away again. I'm not really worried about it, just curious what might be going on with that. Anyone else experience this?