It is normal to feel a filler which is injected beneath the skin to plump up a wrinkle or depression-however a smooth fullness is what we try to achieve.
When patients complain of lumps they are usually referring to an uneven injection-that is the rate of the filler injection is uneven so some areas have little 'balls" of filler while the adjacent area has less or none because the pressure of injection was less asthe needle was withdrawn form the area.
Good manual dexterity and lots of experience and careful technique on the aprt of the doctor who is treating you is the most important factor for a smooth filler injection result.
Another problem that can cause bumps is if the filler is injected too close to the skin.
The best answer is to consult a board certified plastic surgeon who does a lot of filler injections-soemone who does them several times a week and can show you photos of his/her personal results (not photos provided by the filler company on their promotional literature).
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