Get duchess white lotion or Snapchat lotion ( blue color) yes Snapchat o, either of the 2 will even out your complexion, then get a sugar scrub to exfoliate those hands twice or thrice a week. Or use Samira range of products. The trick to knuckles clearing without coming back is stop using what caused them and use good quality skincare to even out and repair. Get a glycolic based cleanser or toner and use every two days on the knuckles as well.