Nobody touches the hair

Ancient Egyptians used to shave their heads and wear wigs so there’s one of two things regarding Atem:

1-He did indeed shave his head and his wild hair was a wig this entire time.

2-His hair is indeed natural (potentially a result of a genetic disorder since Pharaoh families were ridiculously inbred). He was so proud of his hair that he refused to shave his head or even get a haircut. He preferred getting annoyed by lice all the time over getting his wonderful hair even touched by a blade.