system
Given the following post, respond as if you're commenting on Reddit:
human
Why don’t tattoos disappear?

If your skin falls and and replaces itself, how come your layers of skin with the tattoo doesn’t fall off?
gpt
The epidermis sheds. That's the upper layer. The dermis, underneath, doesn't shed, and a well-done tattoo is in the dermis. A poorly done tattoo will shed all or bits over time. (I have both well done and poorly done.)

However, sun exposure can fade the color, if not protected.