Infection and foreign bodies are the causes of serious scars.
The other is sewing level and tension.
I guess you didn't go for plastic surgery, so the thread used is at least 1, and scars are inevitable. But it doesn't matter. After 6 months, the scar will fade and soften. Then go to plastic surgery to repair the scar.
Don't smear any advertisements or drugs that others tell you. Drugs can't solve the problem unless drugs solve the problem. Don't go out in the sun to reduce pigmentation.
I am a plastic surgeon. Don't trust advertisements and well-meaning advice, and don't waste money on meaningless drugs and food.
In addition, a certain proportion of your scars may pull your eyes (upper eyelids). If there is a pull, it means that there is resistance in closing your eyes. Should go to ophthalmology (if there is no plastic surgery, ophthalmology can also) or plastic surgery.