What condition is characterized by yellow discoloration of the skin?

The condition characterized by yellow discoloration of the skin is jaundice. Jaundice occurs when there is an accumulation of bilirubin in the bloodstream, which can result from various underlying health issues such as liver disease, hemolysis, or bile duct obstruction. The yellowing is most evident in the skin and the sclera of the eyes.

In contrast, tachycardia refers to an increased heart rate and does not have a direct association with skin color. Anisocoria is a condition where the pupils are unequal in size, which also does not relate to skin discoloration. Gingiva refers to the gums and has no relevance to skin coloration either. Thus, jaundice is the most appropriate answer as it directly corresponds to the described symptom of yellow discoloration of the skin.