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Objective
To study the clinical efficacy, recurrence rate and safety of 5‐aminolevulinic acid–based photodynamic therapy (ALA‐PDT) combined with microneedle or CO2 lattice laser (CO2FL), in comparison with intrascar betamethasone injection in the treatment of hypertrophic acne scar.
Methods
Fifty‐two patients with hypertrophic acne scars at the mandibular angle were enrolled and assigned to different...