The hyaluronic acids are a gel substance that has a real volume. Often patients are surprised they can feel the material in their skin after injections. Depending on the doctor's goal, some of these areas may feel lumpier than others, especially from inside the mouth. If these areas don't show as lumpy from the outside, then it's a matter of whether they bother you from the inside. The physican can gently massage the lumps during injection to smooth the contour, but you should be careful massaging them yourself, which may risk the loss of volume restoration you liked when you looked in the mirror. After a few days and weeks, the lumpy feeling often goes away on its own.