Hello, I went to the doctor to have a filler injected into the eyes dark circles area, the syringe with the gel (hyaluronic acid) was not new, I know because he took it out of a box but the blister was not sealed, I also saw that the gel in the syringe was not completely full, I saw that he took a needle with a cover from the blister, so I think the needle was new, and he placed it on the tip of the syringe with gel, I am worried that the gel (hyaluronic acid) has been contaminated with the blood of the previous patient whom he injected with the same syringe gel, is this a risk of hiv or hepatitis b or c? Do I need to test? It is save to change the needle for a new one and use the same syringe with gel to inject other patient? I would appreciate your advice