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Regarding your question,

causes of scars ?

• acne
• after surgery
• after burn
• traumatic injury of dermis
• some dermatological diseases

?how to manage acne scars and return glow appearance to the skin

• you should be examined by dermatologist to determine which appropriate method of intervention according to your status
• some modern interventions to lessen acne scars
• dermapen and mesotheapy
• fractional co2 laser
• chemical peeling

all of these methods have drawbacks like burn,injury to your skin, secondary infection
i suggest dermapen and mesotharapy because it is the safest one that relieve scars to some extent
but your doctor can determine which method is best and give the best result
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