You ask what they are. This is the truth: I have no freakin idea!!!!!!!!!!!!!!! So let's all play the speculation game! ^^
The Brief: Naruto has 6 whiskers- 3 on each side of his face. They have been there since birth and so are probably not a direct manifestation of the 9 tailed fox. My guess is that because Kushina had the 9 tailed fox sealed in her during pregnancy, some characteristics of the fox were passed down to Naruto. This is the same way mothers and fathers pass down their traits to their children through DNA.
Possible Materials: my favourite is a thin line of hair, like a beard. When the fox's chakra escapes the whiskers grow thicker so the ability to grow is probably necessary. Scars????? Maybe, although this is unlikely as scars would not be able to grow and shrink back. A skin blemish, like a birthmark???? Quite possible, especially if he was born with them. However, they can't grow!!!!!!!!!!!
So please!!!! I need some help. Together we will solve the case of the "whiskers". *cracking my fingers* Time to go surf.
So please!!!! I need some help. Together we will solve the case of the "whiskers". *cracking my fingers* Time to go surf.