Why Does Restylane Cause Little Bumps Under the Skin?

Any filler injection has the risk of causing irregularities that can be felt, whether these are nodules, granulomas, or simply an irregular amount of filler in one location.
In most cases, the filler will be palpable immediately after injection and can be gently and carefully massaged by the injector without moving it away from the area where the filler was placed and designed to improve. In most cases, any irregularities will smooth out and the injectable will soften over time. If irregularities persist several weeks after injection, some gentle massage at home may also be helpful. With the hyaluronic acid products like Restylane, hyaluronidase can be used to dissolve the product in select cases if needed. The most common cause of irregularities would be improper product placement due to injection technique. Always see an expert physician injector to minimize your risk of problems.
Most patients do quite well without any issues and are very happy with the results. 
All the best,

It’s not unusual for small bumps to occur following
Restylane injections. These bumps occur at the site of the injection and are
related to the injection technique. When Restylane is injected closer to the
surface of the skin these bumps commonly occur. They can be prevented by
avoiding superficial injections. Once they occur, they can be treated with
massage. In most cases, a response is generated within a week of this maneuver.The
best way to avoid this complication is to consult a specialist with training
and certification in this area. It’s also important that this specialist have
experience with injectable fillers.If
you’re concerned about this problem, it should be discussed with your provider.
Your provider should be able to address your concerns.

Thank you for the question. Bumps that you can feel, or irregularities (in color or surface) that can be seen, are generally the result of the injection technique.  If Restylane (or any other hyaluronic acid filler) is placed too close to the skin surface, these issues can result. Particularly in the lower eyelid region, a gentle touch and a clear understanding of the anatomy are keys to a smooth, natural-appearing result.