How to get rid of black dead skin on neck? My face also looks white and fresh whereas my neck is dark? (Photos)

hello doctors Any dermatologist or skin expert tell me please that how i get rid from this black dead skin on my neck that is too much skin color difference between my face and neck . my face looking white and fresh where as neck looking harsh ,dry and rough skin with black color due to hard blackish layer of dead skin . Me using too much face washes ,scrubs o many others products which is available in market but unfortunately i get -ve result please doctors tell me best and reliable treatment

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