5.2. Randomization and Blinding
SCAR
A block randomization method was employed to allocate patients into the following two groups: one receiving incoBoNT-A and the other receiving 0.9% normal saline injections, administered on the right or left surgical scar of the chest, respectively. To ensure blinding, patients and investigators were kept unaware of the treatment assignments. The injections of both incoBoNT-A and 0.9% normal saline were administered by the same independent dermatologist who participated in maintaining the blinding process. The randomization codes were securely sealed and remained undisclosed until the study’s conclusion. This approach ensured that patients, investigators, and research personnel remained blinded throughout the study duration.