I've found that it really does depend on the facility. I work in pediatric oncology, and I have six large, visible tattoos. My patients and families doe not mind, and probably 50% or better of the parents have tattoos. Opinions have definitely changed over the course of the past few years. That said, when I interview, I always wear longs sleeves and make sure that my tattoos are covered. I don't think tattoos are unprofessional, but not everyone sees it as such. In my past life, as a Senior Operations Manager, I hired based solely on ability and resume. Some of my best managers had tattoos, dreadlocks or piercings. Those things doen't impact the ability to do a job, or how well that job is done.