Bruises on belly after insulin shots?

Common problem: This is a common problem. Make sure you are not injecting too close to your belly button. Shorter needles tend to cause more bruising than longer needles. Are you on blood thinners like warfarin, aspirin, or plavix (clopidogrel)? Make sure you are injecting at a 90 degree angle to your skin, not on a slant. The Insulin should work fine despite the bruise.