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Many insects, such as the following, cause mild reactions: Bedbugs. Kissing bugs. Chiggers. Fleas. Flies. Mites. Mosquitoes. Nonpoisonous spiders. Ticks. Scabies. Lice. For more information on lice, see the topic Body Lice, Head Lice, or Pubic Lice. Some insects are more likely than others to cause allergic or toxic...