They can also be small deposits of plaque that have been trapped in throat area behind the tonsils...you can gargle with warm salty water in the back of your throat. Food particles can get stuck in behind the tonsils and decay, then come up when coughing.
Gargling frequently helps keep the areas in the back of throat bacteria free as possible.
Take care...C
i get that too nothing to worry about
what is a Caugh, do you mean cough, those small white patches are mucus. go see your DR .