Bug bite bruise

Complications of Bug Bites

Complications from bug bites include allergic reactions, skin infections, poisoning, and necrosis (skin and tissue death).     


Allergies to stings and bug bites require immediate medical attention. Signs of an allergic reaction include:

  • Flushing
  • Hives
  • Swelling
  • Dizziness
  • Trouble breathing
  • Nausea
  • Loss of consciousness
  • Shock

Around 15% of fatalities from anaphylaxis (severe allergic reaction) are from venom allergies.

Skin Infections

Since bug bites break the skin, they can lead to an infection. Symptoms of a skin infection include:

  • Rash
  • Swelling
  • Redness
  • Pain
  • Pus
  • Itching


Necrosis is when an infection results in the death of skin and surrounding tissues. This kind of infection is more likely with venomous spiders. Necrotizing infections are dangerous and require immediate medical attention. Symptoms include:12

  • Swelling
  • Blisters
  • Skin that turns violet or black
  • High fever
  • Rapid heart rate
  • Confusion
  • Unconsciousness


Not all spider bites can make you sick, but some can. Symptoms of a venomous bite include:13

  • Pain
  • Swelling
  • Necrosis
  • Fever
  • Trouble breathing

Seek medical attention immediately if you experience the above symptoms following a spider bite.

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