Might be that skin sensitivity some people mention. If it's only right at the spot then maybe the nerves there are just more reactive. I'd say going deeper could be better in this case.
I've been doing my weekly injections for six months without any problems until now. The last two weeks I've started getting soreness right at the injection spot. Light contact the next day makes the area feel bruised even though there's no bruise, no rash, and only a small red mark from the needle. Everything else is the same as always with alcohol wipes and a fresh needle. Could the needle be going too deep, or has the fat layer thinned so it's no longer landing in the right place? I've always used the stomach and changed spots each week. This came from a new kit that tested fine. Any thoughts?