ChiCTR1900027249.

Study name	The efficacy and safety of low energy carbon dioxide fractional in the treatment of paediatric hypertrophic scar: a perspective, randomised, self‐controlled study
Methods	Randomised, self‐controlled study trial
Participants	Participants should be/have: 1. Aged 1 to 13 years; 2.Hypertrophic scar was diagnosed by at least 3 physicians; 3. Hypertrophic scar area should be at least 6 cm2; 4. Within 18 months of trauma or burn; 5. Skin type III/IV; 6. No glucocorticoid injection, other laser therapy and other invasive treatments have been given in the past year.
Interventions	Treatment group: a total of 3 lasers, each 4 weeks apart; Control group: without laser treatment, the remaining measures the same.
Outcomes	Primary outcome: Patient and Observer Scar Assessment Scale (POSAS) Score; Secondary outcome: Visual Analogue Scale.
Starting date	Not reported
Contact information	Not provided
Notes