:sl:
Henna isn't a new form of adornment. Like kohl, it does go way back, and Arab brides used to adorn themselves with it just as Indian / Pakistani's do.
"What we think with regard to temporary tattoos is that they come under the same ruling as dyeing with
henna, if they are done in the manner mentioned in the question and not in the way that is forbidden. This permissibility is subject to several conditions:
1- That the drawing should be temporary and will disappear, and not permanent
2- She should not put any drawings of animate beings
3- She should not appear with that adornment before non-mahram men
4- Those colours and dyes should not be harmful to the skin
5- There should be no resemblance to immoral or kaafir women
6- She should not put any drawings of symbols that venerate deviant religions, corrupt beliefs or misguided ways
7- If it is done by someone else, it should be another woman and it should not be put on any place that is ‘awrah.
If these conditions are met, we do not see any reason why she should not adorn herself with it. "
Source