I just went in and gave my son a correction shot. I used the back of his arm, pinched up the skin as usual (we use the pen with 4mm BD needle) and when I removed the needle, his arm started bleeding quite a bit at the injection site. I have never had this happen. Why did this happen? Thank god he was sleeping - I'm sure if he was awake, that much blood would have really upset him. But now I'm wondering if all the insulin would have leaked out, since it started bleeding. Any thoughts?