Could I just have swelling where filler was injected into chin? (photos)

Most surgical procedures, injections included, can cause swelling as this it the body's natural response to injury, and surgery is a controlled injury.  In addition, most modern fillers are hyaluronic acid  based, and this molecule can hold up to 1000x its weight in water!  The molecule draws in water to add volume or "fill" the tissues.  
Characteristics that affect the metabolism of these molecules include the size of the particles, their concentration and the degree of cross-linking.  Increases in particle size and cross-linking increase their inital ability to absorb water and will cause more swelling after injection.  These same characteristics also increase their resistance to degradation by your bodies native hyaluronidase, making them last longer.  
Signs of infection of include swelling but are typically accompanied by redness, discomfort, and warmth.  If you develop the majority of these symptoms, it would be advisable to return to your physician for evaluation.  
I hope that helps!

Thank you so much for the pictures and questions.  Swelling after injections happens with most patients; but typically settles down in about 7 days. Your chin looks nice however, you may want to follow up with your injector to be sure that you are happy with it.  Best wishes

Hello,
It's likely to be swelling and should settle over the next few days. It can take a couple of weeks to settle so unless you are getting any unusual symptoms like pain, progressive redness or any altered skin colour, let it settle down and then go back for your check up.
How many mls did you have? I think the shape should settle down but just keep in touch with your injector if you are worried.