Why did I develop small hard cartilidge bumps on antihelix after otoplasty? (photos)

I had a Darwin's tubicle removed on one ear as well as slight otoplasty of the same ear to match adjacent ear, involving cartilage trimming, no pinning. The top part of my ear feels like all the cartilage has thickened and become stiff, as it's not bendy and delicate like the other ear. Several small hard bumps have developed on my antihelix as well as the helical rim where the Darwin's tubicle was and now has not got a nice smooth contour. I am concerned these cartilidge-like bumps may be CNH.