Which side effect of the Rejuran procedure was the most difficult for you?

I've been looking into Rejuran with interest because I heard it is effective for relieving inner skin dryness and shrinking pores, but I've also noticed there are many reviews regarding side effects.

Which side effect was the most difficult for you to deal with, such as pain during the Rejuran procedure or post-procedure issues like embossing, swelling, or bruising?