The best replacement for bug bite is rash.

The best alternatives to bug bite are rated as following:
★★★★★  rash
★★★★  pimple
★★  spider bite
★★  chicken pox
★  boil
★  mrsa
★  poison ivy
★  staph
★  mosquito bite
★  shingles
★  ingrown hair
★  ibc
★  flea bite
  staph infection
  allergic reaction
  allergy
  x scissor
  zit
  chigger bite
  mosquito

Your alternative for bug bite is not listed? Suggest!
Speaking about bug bite, one probably shouldn't forget about black dot in center.

Other search terms related to bug bite and their ratings are:
★★★★★ black dot in center
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Google Trends

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bug bite
rash
pimple