👉 Mucoids are a type of cancer that occurs in the lining of the mouth, throat, and esophagus. They are usually benign, but they can be very serious if left untreated. Mucoids can grow to be quite large and may cause discomfort or pain when touched. They often appear as small white spots on the inside of your mouth or throat, or as a lump in the throat that feels like a raw tooth. If left untreated, mucoids can spread to other parts of