Q. See question (2722) on tattoos above. Are they a chatzitza for the tevila of women.
A. On question 542 we wrote: “Poiskim rule that stains that have no substance to them, and they just present a superficial coloration of the skin, such as an iodine or a weak ballpoint stain, on the onset they should be removed when possible. (Har Tzvi Y.D. 163, Pische Zuta 198: 26, Shiurey Shavet Halevy 198: 17, Chut Shani 198: 23, Pischei Halocho 2: 296)
However in regards to tattoos, Horav Shlomo Miller’s Shlit’a opinion is that she is permitted to immerse without having them excised, since the stain is under the skin.”

Rabbi A. Bartfeld as advised by Horav Shlomo Miller Shlit’a and Horav Aharon Miller Shlit’a