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I find if my lantus is a new pen and fresh out the fridge it tends to sting a bit just because its colder. Also if I stick to the same area it hurst a bit too so just need to remember to rotate.

I would check your needles if I were you. I have been using these pens for over 10 yeaars and the odd time this happens it has been the needles. I was using a Novofine needle until the size was discontinued and have now switched to a different brand and have no hassles with them.