system
Given the following post, respond as if you're commenting on Reddit:
human
If every ~10 years or so a person replaces the majority of the cells in their body, why do most physical deformities (such as scars or burns) have the potential to last a lifetime?

I guess this question could be probed in a deeper (i.e., why does a heart defect last for an entire lifetime if our bodies are constantly replacing damaged/dead cells) sense, but I figured superficial changes might be easier to visualize.

I'm not sure how to really ask this question with the correct terminology, so please excuse my lack of proper phrasing.  I hope you get the general idea of my question.
gpt
As an analogy: imagine a brick house, you go along and knock one brick out of the wall and put a new one in its place. Continue doing this long enough and eventually all of the bricks in the house have been replaced, but the house still has the same layout and all of the rooms and windows are in the same places.