I have seen where brave women who endured breast cancer and had radical breast surgery used tatoos to cover the scars and their breastless chests to improve their body image. I've seen some beautiful murels on the internet on these women, and it makes them feel better.
Now it's becoming a trend to have medical information tatooed on you...i.e., Diabetes, DNRs, etc., in lieu of bracelets, but medical professionals, especially emergency personnel are not trained to look for the tatoos. I'm sure training is coming down the pike for that eduation.
Anyone who tells you they don't hurt is a liar. I have two of them and regret neither....the Script A and a fleur de lis. But those sons 'o guns hurt. And for that reason alone, I am done with the tats.