About the Dermaroller
The main concern lies in creating a safe, sterile environment at home as you risk introducing harmful bacteria into the micro-channels created in the skin which could lead to infection if the device is not properly cleaned. Some at home devices might have needle lengths that do not classify as a medical device, but then they are not getting into the layer of the skin that would be the most beneficial.
Additionally, a trained practitioner will adjust the needle depth to accomodate the depth of the skin in order to be the most effective for the desired outcome and the dermaroller is a static, shallow depth less than 0.3 millimeters. With regular and long-term use of a dermaroller, users could see an improvement in skin tone and texture and mild scarring, but it does not result in the same benefits microneedling offers.