Please explain why is my skin pale/yellow after general anesthesia?

Hard to tell: It would depend also what you needed general anesthesia for, i.e. Type and duration of surgery, degree of the blood loss, the components of anestesia and your medical history. There is a rare complication of developing hepatitis - and jaundice, potentially- after being exposed to volatile anesthetics, yet it is very rare. And common things are common - would first check with your doctors..