Cockatiel Losing Feathers around ear

Question
My female cockatiel is losing feathers around one of her ears.  It is getting
increasingly worse.  There is a male cockatiel in the same cage that looks fine.  
The male does groom the female, but it doesn't appear that he over grooms her
or is picking her feathers.  What could be causing this small bald spot over her
ears?

Answer
Hello Amber and thank you for your post.
It is possible that the male is over grooming her.  Try seperating the two and see if she improves at all.  Other than that, I can only suggest that you take her to a Certified Avian Vet or an Exotic Animal Vet to have her checked for parasites.

Good luck and God Bless.
Dianna