Getting a filler after reaction from another filler?

Thank you for your question and I understand your concern. Hyacorp is not approved for use in the U.S. at this time. I cannot speak to why you might have had a reaction to this particular filler, but I can say that it is not subject to the same regulations as Juvederm and Restylane since it is not FDA-approved. When the appropriate technique is used in a sterile environment, Juvederm and Restylane are both safe products with a very low incidence of allergic reaction. Make sure you are working with an experienced, board-certified dermatologist to ensure your treatments are both safe and effective. 

Hyacorp is not approved for use in the USA by the FDA and so I do not have experience with it. However, the risk of infection with Juvederm and Restylane, in my experience, is low as long as good and clean technique is used.