Depending on the depth of the filler injection, the deposit is usually palpable. It tells you the filler is there and it feels like a firm lump. Then, a few days later, the lump gradually softens until it disappears. Has the filler disintegrated? Well, before treatment pictures do not always tell you the answers. If the part that was filled is under the eyes, you can do a spectacle test. For instance, if you have a hollow under your eyes before treatment, you may feel that your cheeks can touch the lower rim of your glasses after the injection. You’ll feel that the cheeks will still touch the lower rim of your glasses after the “lump” is “gone”.
Well, it’s actually not gone. Hyaluronic acid (HA) fillers are actually hygroscopic. This means that they absorb water from your tissues. Like sponges, HA filler deposits will absorb water from your body. Like sponges, they will not swell much, but they will soften and give you the impression that it’s not there anymore.
Dental Phobia by Chan Joon Yee