system
Given the following post, respond as if you're commenting on Reddit:
human
How do tattoos stay in skin?

If your skin cells are continuously dividing, dying, and being sloughed off, how does the ink stay there?  Furthermore, if the ECM is continuously recycled - I don't understand how they're so permanant.
gpt
The outer epidermal layer of skin is getting sloughed off. Ink pigment lies deeper in the dermis, and is composed of particles that are too large to be processed away by your lymph system. This is why laser removal works, because the powerful blasts of light break up the pigments into smaller pieces that can be processed and removed by your body.