Like "i use my legs for my humolog, just to keep separation from the lantus which i use my belly for. with 120 units of lantus i need lots of room for it, sometimes doing 6+injection sites because of the burning that occurs sometimes. I use a 31 gauge needle so it should not occur, and I have talked with Doc and pharmacist and they have no explanation for the humolog burning since I am only taking 10-18 at a time. Any ideas? The burning only occurrs sometimes, other times I don't feel a thing, go figure."