Are married women allowed to use method of tattooing eyebrows for someone who lost all hair in eyebrows. I do not know if it is permanent but might last awhile?
If it is not fully permanent, and will fade after some time, there is room for leniency to cover a deformation or restore normal looks, such as missing eyebrows, as this is a case of great need.
There are a number of reasons why such makeup may not fall under the Torah prohibition of “ksoves kaaka”, the prohibition of making marks and writing on one’s skin. This makeup is after all not permanent and fades after some time. It also is not done in writing form, only color is added. In addition it is clearly being done for a practical purpose, namely beautification, and not for religious or superstitious reasons.
Shu”t Minchas Asher 2:56.