Another World's Highest Guild Leader ~I'm the weakest in the guild, but I can't quit the guild because of the heavy love of all the guild members~ - Chapter 19.2

I still can’t figure out why the MC sometimes has a patch of white hair.
Is it something done on purpose?
If so, I don’t know why.
Is it something done on accident?
If so, why have I not noticed it on any other black haired character?
Does it happen other places and I just missed it?
Or is his hair really partially turning white and no one mentions it?