An insect bite occurs when an insect pierces the skin, usually to feed on blood or inject venom, saliva, or other substances. The bite can cause a local inflammatory reaction, which may range from mild irritation to more severe allergic responses.

Common Signs and Symptoms

• Local skin changes:
  • Redness (erythema)
  • Swelling (edema)
  • Raised bump or small blister
  • Warmth or tenderness at the site
• Itching or pain:
  • Mild to moderate itching is common
  • Some bites may be painful, especially if venom is injected
• Secondary changes:
  • Scratching may cause skin breakdown or infection
  • In some cases, a rash or spreading redness may occur
• Systemic reactions (less common but serious):
  • Hives (urticaria)
  • Swelling of lips, tongue, or throat (angioedema)
  • Difficulty breathing, dizziness, or rapid heartbeat (anaphylaxis) — requires emergency care

Key Point

Most insect bites are mild and self-limited, resolving within a few days with simple care. Severe allergic reactions are rare but potentially life-threatening.