What Causes White Spot Under a Person's Tongue?

By Staff WriterLast Updated Mar 26, 2020 1:58:02 AM ET

White spots under the tongue and a white coating on top of the tongue can be signs of oral thrush, leukoplakia or oral lichen planus among other problems, according to WebMD. If a person finds that they have white spots under their tongue, the person should schedule an appointment with a doctor to have an examination and possible tests performed.