>>406975832
Wash your face before and after playing VR! Amazes me how many people skip the before part. Also regular gasket cleaning is recommended. Be it regular water wash or wiping the gasket with 90+% isopropyl alcohol. 
The pressure/rubbing shouldn't be the issue, as the material itself is antimicrobial. 
If sweat is causing it, maybe look for one of those fan inserts for the index.