Hello, Thanks for your query. White spots under the tongue may be caused by Lichen planus. It is an inflammatory conditions that can affect various parts of the body, both internally and externally. Internally the condition attacks the mucous membranes of the body. As such it may affect the nose, mouth, and vaginal area. This condition will be accompanied by blisters (white spots), pain, itching, or other symptoms. Some symptoms are isolated to specific body parts. Treatment options will vary but may include the use of anti-inflammatory drugs as well as painkillers. Antihistamines and ointments may be used. I do hope that you have found something helpful and I will be glad to answer any further query. Take care