[spoilers] Lucas and his tattoos

[Margaret]

I've been quite fascinated about all the information that people have provided about the meaning of Lucas's tattoos. When I first saw them I wondered about the wisdom of a spy having all those tattoos.

Do you think it could be a little insecure/unwise for a person who needs to go 'under cover' as part of their job to have their body 'marked' in such a way? I could have missed something, but we don't really know the reason why the Lucas character has so many tattoos, or do we?