My little boy is 2 and has been couching a bit like he has something stuck in his throat or clearing his throat like there is something stuck, he has also been putting his hands in there like he is trying to get something that's stuck. I took him to the doctors today after looking in his mouth with my phone torch and there is a white streak down his tonsil. Like bright white. Any ideas? The doctor looked for about a second and says its fine and was non committal about the white streak.