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Symptoms of Insect Bites

• 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.
• 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.

Cause of Insect Bite Reaction

• The skin bumps are the body's reaction to the insect's saliva.
• While the bug is sucking blood, some of its saliva gets mixed in.

Anaphylaxis With Insect Bites: Very Rare

• A severe life-threatening allergic reaction is called anaphylaxis.
• The main symptoms are trouble breathing and swallowing, starting within 2 hours of the sting. Onset is often within 20 minutes.
• Anaphylaxis can occur with bee, yellow jacket, wasp, or fire ant stings. Anaphylactic reactions are very rare after other insect bites. Reason: other insects don't have venom.

Problems Caused by Insect Bites

• Impetigo is a local bacterial infection. Gives sores, soft scabs and pus. Caused by scratching or picking at the bites. More common in itchy bites.
• Cellulitis. The bacterial infection spreads into the skin. Gives redness spreading out from the bite. The red area is painful to the touch.
• Lymphangitis is a bacterial infection that spreads up the lymph system. Gives a red line that goes up the arm or leg. More serious because the infection can get into the bloodstream (called sepsis). Needs urgent exam and treatment.