User blog comment:B214/Question and Answers/@comment-24.185.86.79-20121228031711/@comment-1359322-20121228043841

Yes, Issei's whole body is currently a Dragon's body including his left arm. About his life span the author hasn't writen on that part so it is still a mystery. Well at least Rias and Akeno no longer needs to regularly "suck" out Issei's Dragon blood from his left arm.