What is behind Biden's ear?

In response Elaine Shtein to her Publication

some masks are adjustable. this is oart of that

It doesn't appear to be part of the mask rig. Ha mask rig, anywho. Screenshot might help but also notice the whoite skin color around it seems raised but might be normal but the black hole does look different huh ;) We could ask his super nice and informative Press Secy ;)

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