reconstruction (involving medical tatooing) after mastectomy

i am a 46-year-old single (but looking) woman who had a mastectomy and breast reconstruction after having been diagnosed with breast cancer a little under two years ago. the second stage of the reconstruction involves creating a new nipple and then tattooing the skin around to match the areola of the other breast using micropigmentation/medical tattooing. is such a procedure halachically permissible?
what are the halakhic issues involved? is there a heter available for such a procedure?

thank you very much