Old scars. Is there any risk of subcision and laser? (Photo)

I had accident when i was child since 10 years ago or more and i had scars on my face and above eyebrow ,deematologist recommended laser for treatment i tried it but i didnt get benefit from the session so i stopped laser treatment .so he recommended combination of subcsion and laser Is there any risk of subcision and laser ? Or could it lead to worse results ? What are the best treatment of these old scars ?

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