I had a benign petuitary tumour removed in dec 2013 and have been taking hydrocortisone tablets since. i want a tattoo but unsure if safe to get one.

Better not: Although there's no direct relationship, tattooing might not be advisable in your case, external steroids, even when taken for compensation, might have some adverse effects on the skin with prolonged usage, at any rate have the input of your endocrinologist as well

No if my kid!: He faints with a simple needle stick. Without adrenal hormones, stress can cause circulatory collapse. With him, a tattoo is dangerous. Of course with most people just getting stuck with a needle is a minor stress, tolerated well and little risk. Extra steroids outside of the body are unlikely to do much INside the body if/when absorbed (10grm 1% creme...10 mg @most) also, I'd kill him.