Thanks for your question - As the other surgeons mentioned you are likely feeling some suture. But you may also be feeling some bunching or gathering of the skin. Not to worry this usually goes away after a few months too. Be sure you stay in close contact with your plastic surgeon.
Yes, it is totally normal to feel bumps behind your ears early after surgery. They are probably the stitches that will dissolve over the next couple of months. Keep in contact with your surgeon who will be best able to guide you during this post op period.