system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why are healing scars (scratch, cut, incision) SO itchy?
gpt
Because the nerves in the damaged tissue are regenerating and forming connections, as well as all the other tissue being constructed around them. Random stimulation of the nerves sends spurious signals to your brain that you feel as itchiness and discomfort. 

It's like living next door to an apartment being renovated. They might work quietly but every now and then someone drops a tool and you hear it through the wall.