I have like 11 or so different headphones, the problem with using them long term for hours on end everyday is inevitable. The area where the band sits on my head is noticeable with minor hair loss and the hair being pushed down when the headphone is taken off.
I've found wearing a hat and putting the headphone over the top of that helps a little bit, makes the valley on your head less noticeable since your whole head is pretty much being covered by something. But because it's extremely hot here in Texas I've stopped doing that, I've opted to wear my aftershokz bone conduction headset(only running stereo not using the mic) if I'm not listening to music or playing a game now... doesn't sit on my head at all, no hair loss and no noticeable indention of hair.