What is the best way to get rid of the scars on the photograph below? (Photo)

What is the best way to get rid of the scars on the photograph below? They are about 10 yrs old. The biggest one is 3 cm long and 4 mm wide, about 0.5 mm elevated from the surface of the skin. They are on the top part if my left arm, between elbow and wrist.

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