Shama-il Tirmidhi Chapter 005, Hadith Number 008 (043).

Jaabir bin Samurah R.A. was asked: "Were there any white hair in the blessed head of Rasulullah (Sallallahu alaihe wasallam)? He replied: 'He only had a few on the middle parting, and when Rasuullah (Sallallahu alaihe wasallam) oiled his hair, they did not show'".

Commentary.
This narration seems to contradict the one related by Anas R.A., which has been mentioned in the beginning of this chapter. There is no complication, as there were a few white hair in the parting, that used to be covered by other hair. When oil was not rubbed in, they became visible. Therefore, if this is not mentioned in any hadith, there is no complication or harm.