"A dermaroller is an instrument that creates micro pathways in the skin for product to better penetrate," Smith explained, referring to dermarollers with a 0.1 to 0.2mm needle size. Those tiny needles, she said, "wouldn't necessarily be for collagen synthesis. It's a great way to get your products to absorb and penetrate the skin." Smith suggested the Environ Cosmetic Gold Roll-CIT. When the needle is larger, like 0.5mm, that's when you're getting into "wound healing stimulation," Angelica said, "A dermaroller creates tiny pricks around the skin and gives enough space in between so the wound healing response takes over. You grow new skin." That, in turn, leads to a smoother, more even, and plumper complexion.