What does a blue tongue look like?

A blue tongue typically appears as a notable bluish or purplish discoloration of the tongue's surface. This condition can be caused by various factors, including lack of oxygen, certain medical conditions, or ingestion of specific substances. In animals, particularly in blue-tongued skinks, the blue tongue serves as a warning signal to potential predators. In humans, it may indicate underlying health issues and should be evaluated by a medical professional if persistent.