my horse has that too. if the scaps arent covering bleeding or anything i would just take a wet rag and lightly scrub out her ears to get rid of all the scabs and all that gross stuff from the bugs. after i would prob put on a flymask that covers the ears. hope this helps!!!
I would use a fly mask with ears to keep the bugs out. What I do to keep the bugs off when riding is just spray a bunch of fly spray on your hand and rub it on their ear. I don’t put it on the inside though. Good luck!