Depends on how many and where!
I sometimes have thai massage from girl who has a small jewel piercing in her nose, which is small enough not to make me stare. She is Asian, at it is part of her culture.
I havea client that I initially found difficult to deal with - especially her tongue peircing, as she kept sucking at it during the treatment. Her ears are pretty much ringed - about 15 holes in each. Lower lip in two places/both eyebrows/both nipples/belly button and (she informs me) a labial ring too! She comes to me for lymphoedema treatment, having had breast cancer two years ago - she is 39.
Personally, I think it would depend on the treatment you were giving me, as to wether it would 'upset' me! If patients can close their eyes, then it shouldn't come up for discussion.