Why does the face become dark after kidney cancer surgery?

Facial darkening after kidney cancer surgery may be related to factors such as surgical trauma, decreased immunity, endocrine disorders, and drug side effects. 1. Decreased immunity: A patient's immunity may decline after surgery, making them more susceptible to bacterial infections, which can lead to facial skin inflammation and pigmentation. 2. Endocrine disorders: Surgery may affect the normal functioning of the endocrine system, leading to increased melanin secretion, which can cause facial darkening. 3. Drug side effects: Certain medications used after surgery, such as targeted drugs and immune checkpoint inhibitors, may cause skin pigmentation as a side effect. 4. Other potential causes: Other conditions that may cause facial darkening, such as liver disease and adrenal dysfunction, should also be ruled out.