Stress tongue or anxiety tongue is unique. Excessive stress might manifest itself on your tongue as red blisters and ulcers (canker sores). Also, if your tongue looks to have marks around the margins, this might indicate that you bite your tongue often to control stress.Stress tongue or anxiety tongue is unique. Excessive stress might manifest itself on your tongue as red blisters and ulcers (canker sores). Also, if your tongue looks to have marks around the margins, this might indicate that you bite your tongue often to control stress.