Thats cool, I have been looking for a good picture that shows her tattoo.. I am not sure many people know Hawkeye has a tattoo on her back.

Looks like it's marred by a patch of scar tissue up near her shoulder, though. Is that what that is? Should add the scar tag, if so.

Yes, she has a scar on her back. Tag added.

I just noticed the tattoo on her back is the same as the one on Roy's glove OO

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.

You are correct, Green4132 - he did so at Riza's request, quite reluctantly. she had to hound him severely to make the tatoo unusable.