What is the definition or description of: white patches inside mouth?

White patches on the inside surface of your mouth can have different causes. They can be from chronic irritation or injury to the inside of the mouth or thrush which is a yeast infection. The thrush can be wiped off, the jury white patches cannot be wiped off. Thrush needed to be treated. White patches can also be a sign of precancerous changes for mouth cancer. Should see a doctor to assess.