My nail borders, both on my hands and toes, are turning black, as well as the skin around them having a black hue as well.

It is difficult to determine the exact cause of your symptoms without more information. It is important to consult a medical professional to properly diagnose and treat the issue. If you have noticed any changes in the appearance of your symptoms or if they have worsened, it is important to seek medical attention promptly. It is also important to mention any underlying health conditions you may have, such as diabetes or hypertension, as they could be related to the symptoms you are experiencing.