Which of the following is NOT a common complication of diabetes?

The correct choice is skin cancer, as it is not typically classified as a common complication associated with diabetes. Diabetes primarily causes complications directly related to the body's inability to regulate blood sugar levels effectively, leading to various forms of damage to blood vessels and nerves throughout the body.

Retinopathy, neuropathy, and nephropathy are all recognized and well-documented complications stemming from diabetes. Retinopathy refers to damage to the blood vessels in the retina, potentially leading to vision problems or blindness. Neuropathy involves nerve damage, which can result in pain, tingling, and loss of sensation, particularly in the extremities. Nephropathy is characterized by kidney damage caused by high blood sugar levels over time, which can progress to kidney failure if not managed effectively.

Skin cancer, while it can occur in individuals with diabetes, is not directly caused by the disease nor is it one of the primary complications listed in diabetes management and care. Thus, it stands out as not being a common complication of diabetes compared to the other three listed conditions.