[skin concerns] fading PIH on sensitive reactive skin?

Beauty Tips For Body Care
I know that these ingredients are used to help fade PIH: AHA, BHA, Niacinamide, Retinol, Vitamin C, Hydroquinone.Out of those ingredients, which ones are most suitable for very sensitive skin? (Least likely to cause irritation, breakouts and redness)
Girls Blog 2015
Submitted by ContemptuousSigh