Red scars on the skin can be treated with the pulsed dye laser such as the VBeam. I use this with tremendous success in my patients.
Brother Bit Me On My Cheek When I Was 1 Year Old. It is 13 Years Old and Red. How to Remove?
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Long term redness of scar
You would need to see a dermatologist or plastic surgeon, but there's a good chance that a vascular laser like Vbeam could reduce the redness. Expect it to take several treatments to gauge how effective it will be for your particular situation.
A vascular laser will "seal" tiny vessels that are close to the skin surface.