What Are Some Causes of Red Patches on the Tongue?

What Are Some Causes of Red Patches on the Tongue?

The common causes of red patches on the tongue are deficiency in B vitamins, geographic tongue, scarlet fever and Kawasaki syndrome, according to WebMD. Canker sores cause shallow ulcers that have a red margin.

Deficiency in vitamin B-12 and folic acid leads to a red tongue, states WebMD. Geographic tongue causes red patches that look like a map. The patches may shift their position on the tongue and are harmless. Scarlet fever causes a red tongue and a high fever. It mostly affects children between 2 and 10 years of age. Kawasaki disease affects the blood vessels and is common among children under 5 years old. It is not contagious.