3 years ago, I had an otoplasty on my left ear. It is redder than the right ear. What could be causing this?

I do have a bump in the stitches behind the ear. My skin is ruddy but the left ear (otoplasty) is noticeably redder than the right one. Heat and stress seem to make the problem worse, and we are having some hot weather now! Does anyone know if anything can be done to remedy this problem? The permanent stitches are still in but I am also worried about nerve damage.

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