Hyperpigmentation - I had CO2 Fractional Laser 14 days back for my acne scar. May be result of high UV rays of sun. (photo)

Today,after finishing my class, I just walked with my friend on the streets while the sun was just above me.I did not bother about the skin as I had put on sun screen. But,returning home, I was just shocked looking at my face as it was hyperpigmented.Should I use Retin-A or hydrocortisone for getting rid of this.Thanks

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