You mean curse. His curse gives him more power and he grows wings transforming into a creature. The original curse mark came from Juugo, a character in Shippuden.
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o_O He doesn't have one.
Nope.He just has,like a Bajillion brothers...
The red eyes of the Uchiha clan are known as the Sharingan.
The blood of 1000 innocent souls.
July 23 according to the Naruto wiki. (Not wikipedia.) See attached link.