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I understand 100%!

Sinus cavity, most likely just air being pulled in and out, similar to nostrils when they flare or get smaller from breathing.

Perhaps if there’s no other symptoms and it’s not acting any differently than the others, I personally wouldn’t worry about it.

Are they coughing or sneezing? Any swelling around the eyes or sinuses? Are you able to provide a video of them doing what you’re describing?