How to stop pigmentation at the right stage?

Stage 1: Before & during trauma/ sun exposure- Apply Antioxidant - Niacinamide, Tocopherol, Green tea, Ferulic acid, Resveratrol,
L- Ascorbic acid+ Sunscreen

Stage 2: Right after the trauma- Use Retinoids, Niacinamide & soothing agents as Allantoin, Hyaluronic acid.

Stage 3: During melanin synthesis- Add Hydroquinone, Alpha Arbutin, Kojic Acid, Azelaic acid, Vitamin C, Resveratrol in your skincare.

Stage 4: After melanin synthesis- Use Niacinamide, Retinoids.

? There is no certain time when a trauma turns into a full-fledged pigmentation and hence using these ingredients every day helps in reducing pigmentation.