Can fish oil get rid of acne marks?

No : However, omega 3 fatty acids can help the skin retain moisture. Skin that is better hydrated is firmer and more supple. Acne scars may appear less noticeable when the skin is better conditioned.

Doubtful: Krill oil and fish oil are the new snake oil, both are high in omega 3 fatty acids which are extremely fragile. Omega 3 fish oils reduce triglycerides by impairing the liver's ablility to make them. However the oxidative stress caused by fish oil actually raises LDL cholesterol. Some day we may use the phrase "this is just more fish /krill oil" or "here comes the fish/krill oil salesman".