Removal of Hypertrophic/Keloid Scar from Upper Arm/Shoulder? (photo)

Hello, car accident left scars on my upper arm & top lip. Arm scar is a 2 -part scar & in the past Ive had injections that were 100% ineffective. I had an excision & same day radiation on both arm scars at 2 different times but the higher arm scar had - No post surgery compression or silicone sheeting & the bottom scar did. Stitching was only in 1 wk & I believe that was a factor in results, are there any suggestions from this point to minimize wideness and remaining unsightliness of scars.

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