White skin coming out on 5th day after FUE. Is this normal? (Photo)

You should see your doctor if you are concerned about post operative issues. White skin may be scabbing or dead grafts.  You really cannot know for sure without an examination.

Appears to be normal process in your healing.  In the pictures you submitted, your grafts do look a bit dry, use some vitamin E oil daily on them for the first few weeks. 

There is nothing to worry
about. Some white spots may appear at the root of the grafts after washing your hair; this is not unusual: the skin at the top of the grafts may sometimes absorb some water. Crusts usually also appear after a hair transplant, this is normal. You just need
to make sure that both the recipient and the donor areas are as clean as
possible during the postoperative period so that regrowth can be optimal. So
this is very important to scrub the crusts during the shampoo. Pay attention to
use your fingertips, not your nails. You can also apply sweet almond oil in
order to soften the crusts.