![After initial injection, pigment is dispersed throughout a damaged layer down through](https://i.imgur.com/Td7mPzcm.jpg)
After initial injection, pigment is dispersed throughout a damaged layer down through the epidermis and upper dermis, in both of which the presence of foreign material activates the immune system's phagocytes to engulf the pigment particles. [wikipedia]
Fapucational, nsfw