Discomfort
Individuals may experience discomfort at the time of injection if the injection is not deep enough. The area may become red or swollen; these symptoms will cease in a few hours. Individuals may also experience bleeding at the injection site. This occurs if a small blood vessel is broken. If the blood seeps into the surrounding tissue, you may notice some discoloration. This will resolve in a day. It may be necessary to use a slightly longer needle, or inject vertically rather than at a 45-degree angle to ensure the insulin is reaching the fatty layer.