1) Make-up !
2) Light can help a bit :
Thinner : use silk diffusion
Older : in addition to the make up, a hard contrast light, low key can help
Younger : diffusion filter on the camera might help : Soft FX, Black or white Promist, Low con, even a tight at the bottom of the lens or in front of it is a famous trick, and diffused light of course. All these tricks trying to make the skin look more perfect, with no scars and marks etc. can help
Cosmetic peach is a basic gel in that aim.