Detailed answer

Dark spots on the skin are usually caused by hyperpigmentation, which is the excess production of melanin in the skin cells. Bladder cancer, on the other hand, primarily affects the bladder and does not directly cause dark spots on the skin. However, it is important to note that each individual may exhibit unique symptoms, and in rare cases, bladder cancer may spread to other parts of the body, which could potentially lead to skin abnormalities. If you have concerns about dark spots or any unusual skin changes, it is always recommended to consult with a medical professional for a proper evaluation and diagnosis.