The best replacement for pallor is cyanosis.

The best alternatives to pallor are rated as following:
★★★★★  cyanosis
★★★★★  blanching
★★  icterus
★  flushing
★  pallor
  paleness

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Speaking about pallor, one probably shouldn't forget about anemia.

Other search terms related to pallor and their ratings are:
★★★★★ anemia
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pallor
cyanosis
blanching