Post skin graft hyperpigmentation & wrinkles? (Photos)

I underwent split thickness skin grafting two years back on my forehead which was scarred and uneven due to childhood burns.The graft take up good but it has fine wrinkles and it was dark compared to my cheeks. Can I use retinol creams to get rid of wrinkles and is there any cream I can use to get rid off hyperpigmentation. These wrinkles really bother me, I don't have any fat or muscle on my forehead. It's hard like I could tap on my skull.

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