My son is worried about red acne marks.

Hello, my son is in his 20s and his acne has decreased, but he is very stressed about his appearance because of the dark red acne scars that remain. He is upset because the scars are so numerous and red, and his skin looks dirty. I want to help him, but I don't know much about skin, so it's hard to give advice, so I'm asking.

I'm curious about effective and quick treatments for acne scars. Is dermatological treatment necessary, or can I achieve sufficient results at home with vitamin C or high-performance cosmetics that help soothe redness and reduce scars? It would be especially helpful if you could recommend products that are gentle on men's skin and a specific daily routine. If you have family members who have suffered from acne scars, please share your thoughts.