I don't know what I'm doing wrong but virtually every time I've injected my Lantus over the last week there has been bleeding and then bruising at the injection site. I was told to use my upper leg. I just can't work out where in my upper leg to inject it without this happening. I've tried the front, the side. Doesn't make a difference. I'm pretty lean and don't have much fat to pinch up but, even so, it's odd that it only happens occasionally (although it's getting more frequent). If the injection site bleeds does that mean I probably didn't get a full dose?