Causes & Health Information
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Symptoms
- Insect bites usually cause a small red bump.
- Often, it looks like localized hives (one large one or several small ones).
- Sometimes, a small water blister occurs in the center of the bump. This is common in younger children.
- Itchy Insect Bites. Bites of mosquitoes, chiggers (harvest mites), fleas, and bedbugs usually cause itchy, red bumps.
- Painful Insect Bites. Bites of horseflies, deer flies, and gnats usually cause a painful, red bump. Fire ants, harvester ants, blister beetles, and centipedes also cause a painful, red bump. Within a few hours, fire ant bites can change to blisters or pimples.
Anaphylaxis With Insect Bites: Very Rare
- A severe life-threatening allergic reaction is called anaphylaxis.
- The main symptoms are difficulty breathing and swallowing starting within 2 hours of the sting. Onset usually is within 20 minutes.
- Anaphylaxis can occur with bee, yellow jacket, wasp, or fire ant stings. Anaphylactic reactions are very rare after other insect bites.