Al-Harith bin Abdullah said:*" A man from the progeny of Abi Sufyan comes out, from the drought valley, with (an army carrying)*red banners. He has thin arms and thin legs, with long neck, very yellowish (meaning pale) in complexion, on him (can be seen) the mark or sign of worship."*(Nuaim bin Hammad'sKitab Al-Fitan)

http://www.discoveringislam.org/signs_before_mahdi.htm