Follicular Unit Extraction technique also commonly known as FUE Introduction Percutaneous collagen induction (PCI) or needling techniques are increasingly popular in aesthetic practice. The underlying mechanisms of action rest on producing a pattern of non-ablative and non-confluent puncture wound pattern to the dermis with a resulting regenerative effect on the skin. The majority of publications in the scar literature focus on the use of PCI in the context of atrophic scars with no currently available summative reports appraising the pertinent evidence relevant to non-atrophic scars. Methods A detailed English literature review was conducted using PubMed Medline, Embase and Web of Science; the manuscripts were appraised and classified according to the Joanna Briggs Institute Levels of Evidence. Results are presented in descending order of evidence.