Any ways to prevent keloids from forming after Csec?

I heard you should avoid eating fish after c-section. I checked with my friend who has c-section and has keloid scars, she mentioned her gynae prescribed silicon dressing called Cerederm (10pcs to be used over 40-60 days since 2nd mth). It is placed over the scar and prevents formation of Keloids. Her scar now looks light pink and blends well into the surrounding skin.