Likely molting as the reason for the loss of feathers in this area. It is not uncommon for feathers of the head to molt in groups.
A couple are lost to the molt and a few more as a result of scratching or rubbing.
When feathers are loss as a group, being concern is a proper response! Keep an eye of the area for redness or a crusting white surface developing. If seen, its time of a quick trip to your Avian Professional.
Eclectus, CAG, BH Pionus, Maximilian’s Pionus, Quakers, Indian Ringnecks, Green Cheeked Conures, Black Capped Conures, Cockatiels, Lovebirds, Budgies, Canaries, Diamond Doves, Zebra Finches, Society F