That's because, if you follow the manga or the anime Brotherhood carefully, Riza's tattoo is the secret to mastering the strongest form of Flame Alchemy and Roy Mustang also uses flame alchemy. This tattoo was made by Roy's flame alchemy teacher, which is none other than Riza's father.
I don't know why she has a scar on there though....
makkun said: That's because, if you follow the manga or the anime Brotherhood carefully, Riza's tattoo is the secret to mastering the strongest form of Flame Alchemy and Roy Mustang also uses flame alchemy. This tattoo was made by Roy's flame alchemy teacher, which is none other than Riza's father.
I don't know why she has a scar on there though....
If I remember it right Mustang made that scar with his flame so that no one else would learn that flame alchemy.