What length should the needles be on the dermaroller you purchase? Ciraldo says there are two options if you're looking online: a hand roller or an electrical or battery run stamping device.
"In most cases, it's wise to start with a simple handheld roller device with needles on the roller," she says. She suggests 0.25 millimeters as a good starting point. "For more aggressive treatment, there are battery operated or electric devices that work like a stamper so that the needles penetrate several times in the same area. This kind of device will be more effective for deeper lines and wrinkles as well as indented acne scars," says the dermatologist.
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