Tattoos in Halacha: Is microblading permitted? | The Real Deal- avoiding legal trouble

Is it microblading Assur because of tattooing?
Does it have to be for Avoda Zorah?
Does it have to be words or picture or a mark is enough?
Does it have to be permanent?
How many levels of skin does it have to penetrate?
Would it be Mutar for medical reasons, Shidduch reasons or even cosmetic reasons?