Hello, you mean what happened to the oatmeal caramel macchiato that has been left for a long time with many big bubbles? Oat caramel macchiato has been left for a long time, and there are many big bubbles, which are liquid components and will produce bubbles. Oat caramel macchiato is a drink containing oats, caramel and milk. If it is left for too long, the liquid components inside will produce bubbles, which will produce many large bubbles. When making oatmeal caramel macchiato, you can try to avoid excessive stirring and reduce the generation of bubbles. The prepared oatmeal caramel macchiato should be drunk as soon as possible to reduce the bubbles generated during storage.