Detailed answer

Yes, hyperpigmentation can sometimes indicate poor kidney function. When the kidneys are not functioning properly, they may not be able to effectively filter waste products from the blood, leading to a buildup of toxins. These toxins can cause changes in the skin, including hyperpigmentation. In conditions like chronic kidney disease or acute kidney injury, excess melanin production can occur, resulting in darker patches on the skin. It is important to note that hyperpigmentation alone is not definitive proof of kidney dysfunction, and further medical evaluation is necessary to determine the underlying cause.