I know posts like this have been done, but some are quite ancient, so there goes another one!
A lot of people mention in general mention the dye should not be touching the scalp, but I die hair at home and usually after mixing the dye with perioxide, I put it on like a shampoo and massage it in, so it most definitely touches the skin. I have small patches where white hair grow out on the front of my head as well, so very visible and not very pretty.
I am not that fond of an idea of highlights, and also I have been using the same hair dye for ages, in a colour I love and got a lot of compliments on, and it lasts forever, have not found anything similar in any stores here (in UK they only sell those dyes to professional hairdressers, so I have been getting it from abroad).
Finally, hairdressers in my area are so expensive, and I just can't justify/afford paying for both a cut and hair highlights on very long hair.
Now what I am interested in is whether there is official advice on this from midwife/doctor etc, as google is a scary place when you look for advice on anything related to pregnancy. The only thing I could think of is to try to adapt my 'technique' to try to use the brush and not touch the skin and rinse off quickly- any other advice?