Ive had mine now for a week and like you have 2 sleeves so no spare skin

I am also in the process of dropping my levimir as ive been having hypos in the night I was not aware of! This sensor is really changing my life for the better. It has been so close to my blood readings on my other meter that I am very confident the tattoo issue must be in relation to them perhaps having no trials of people with tattoos maybe?
My nurse classed my tattoos as scaring of the skin, which I replied was not true at all. I guess they are just bound by the rules as to what they can and cant say maybe?