Why does Rin Nohara have purple stripes on her cheeks? Not much to explain. Why does Rin Nohara have purple stripes on her cheeks?
It's most likely a sign of her clan. Kiba has the red stripes, as does the rest of his family to symbolize clan members. But, it could be just a symbol of her personality or being, as many characters, such as Chouji, Chouza, Hiruzen Sarutobi, Jiraiya, Orochimaru, Itachi Uchiha, Kankurou, Gaara, etc. have their own, which are shown not to be associated with any of the other members of their clan. So take it two ways, it's either a clan symbol, or just a way of having their own style or their beliefs.