Dreno 2003.

Methods	Double‐blind randomised study
Participants	Patients with acne scarring and post‐inflammatory pigmentation
Interventions	Diacneal® cream (combining retinaldehyde 0.1% and glycolic acid 6%) compared with excipient
Outcomes	Evolution of the scarring score (a scale for scarring with 5 gradings: pigmentation, atrophic scars (with 3 stages: V, U, W), excoriations, elastolysis and hypertrophic scaring) at D28, D56 and D78 and the global opinion of the participants Tolerance (erythema, dryness, pruritis, burning, stinging), new scarring and counts of retentional and inflammatory lesions, cosmetic qualities of the products
Notes	Abstract only. Abstract does not contain enough information for 'Risk of bias' assessment and completion of the Characteristics of included studies table