It does indeed look like there is a stitch getting ready to extrude. You should return to your surgeon. It may be best to remove the stitch before it becomes infected.
Otoplasty 3 weeks post-op
It is difficult to say what the issue is behind your right ear. You should schedule a followup now with your otoplasty surgeon. It sounds like you're happy with the external look of both ears which is great. However, you should have your surgeon take a look at the issue behind your right ear. They might very well just follow this over time and further healing but you deserve that reassurance. I hope this information is helpful for you.
Stephen Weber MD, FACS
Denver Facial Plastic Surgeon