Our skin is biggest part of our body and skin has 3 layers:
- Subcutaneous tissue
Micropigmentation with your skin layer
The best results are achieved when pigment is placed in the upper third of the dermis. If the needle is injected deeper, the pigment will appear bluish/greenish because of the wrong light refraction or not be visible at all due to the fact that light waves cannot penetrate that depth.
Even more complicated since the thickness of epidermis varies in different parts of the body and even alongside the same area.
The thinnest area is the eyelid and the thickest is the feet.