What is the lump, swelling, and bruises when injecting hyaluronic acid?

It is extremely rare that unexpected swelling occurs by injecting hyaluronic acid.
In that case there is a possibility of allergic reaction (which is said to be very difficult in theory).
In some cases it may be necessary to inject an enzyme agent that degrades hyaluronic acid.
More commonly seen are “lumps” and “bruises”, but the lump is easy to get out or not in relation to the hardness of hyaluronic acid used and the thinness of the skin at the injection site.
Regarding bruises, if you are taking medications or supplements that have blood-thinning action (Vitamin E, fish oil, aspirin, etc.), those who came to treatment after stopping them for more than one week It is safe.
If that is not the case, I think that big bruises will not happen often.

Dr. Kure