Glasses indenting skull behind ears.

For decades I have worm glasses.  Over the years they have made
indentations behind the ears.  I've tried loosing the glasses a while
ago to the point where if they were any more loose, they would fall
off.

Still the indetions remain., and they are starting to cause pain.  

I have searched the web as well as my local optical shops., but I am
not
finding any "glasses foam" / padding or whatever one might expect to
exist.

Is there a product name for this?  Does it exists, and I'm just going
to the wrong shops?

Thank you,

Edwin Davidson.