Marioc,
Congrats on your successful transplant.
But why? Why? Why would you want a tattoo? You should be thinking about everything you can do to keep your body healthy and strong. I'm sorry, but even that you ask the question makes me know that you have doubts. On the one hand a healthy body, on the other hand a tattoo. Is this some life altering tattoo that you need?
I am sorry to come on so strong, but even in a person with a healthy body, I question the need to "decorate" the body. If you feel the need for decoration, go buy some colored hair gel and be red or green or pink on occasion. Or jewelry.
I have breast cancer and have had chemo and radiation. I cannot even have a manicure for the risk of infection. A tattoo?
Edited to add: Be sure to check with your doctor fisrt. Then shop carefully for the right tattoo artist, get good references and check them out, and make sure you ask for a tour of the facilities and an explanation of how they protected their customers from contagion, including seeing the autoclave and making sure they used fresh disposable needles.
You should really consult your doctor, because you probably are on immunosuppressants and might not be a good candidate for a tattoo because of the risk of severe skin infections. A friend of mine is on immunosuppressants, and am not allowed to get any tattoos or piercings, as are all other immunosuppressed patients at the clinic she goes to.
Finally: One other thing for you to consider is that you may need an MRI someday. Some facilities will not do an MRI on a patient with a tattoo unless they get prior permission from their Dr. AND their insurance company. I think the insurance company may be the tricky one there.