Retin-A or Silicone Sheets for toddler scar treatment? (photo)

My 3 year old daughter fell and hit her head, resulting in a vertical cut on her forehead that needed 4 stitches. Unfortunately after the stitches were removed the healed wound opened. The dermatologist gave us Retin-A and said eventually the scar will fade but isn't Retin-A used for acne? I want to use Silicone sheets as I think they would do a better job of healing the scar faster. What should I do?

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