A. Why not? But, take some time and see if there is an entity or specific power you are drawn to, or form a relationship of some sort with. The last thing you would want to do is have a permanent link to an entity that may not work with you -as sometimes happens... or simply forcing a connection with a being that it's incompatible with you and your direction.
So, you do not want to do this unless the daemon is your patron, daemon companion or you already have a good relationship with them, because you would be essentially calling their energy into your life permanently. Your auric bodies and energy fields can be influenced and consequently affected.
The option to banish if their energy is making you sick, or incompatible with you in some way, would no longer be an option...

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Its important to say that in certain levels or magick practices, the magick marks (tatoos) have a higher relevance, spiritual meaning and power than conventional tatoos...