Thank you guys for your reply!
Is there another way, beside nanotattoos, to have a tattoo glowing and/or maybe changing the design by time?
If iam not complete wrong, Bio Tattoos can change the design, but only over a long time, so that wouldnt fit my idea. Because i was thinking about a glowing arm tattoo that would constand change the design, so fast you can see it.
It doesnt need to be a SR5 modification, can also be SR4, if you know one.