20 Cause of Petechiae and What You Need to Know About Them

17. Snake or Insect Venom Exposure

Some types of venom—especially from vipers or certain exotic insects—can cause blood vessel damage and disrupt normal clotting, leading to petechiae. These small red dots may appear near the bite site or spread systemically depending on the potency of the venom. In some cases, the venom causes hemolysis or direct platelet destruction, leading to internal bleeding. This can be a medical emergency, especially in areas where access to antivenom is limited. If petechiae develop rapidly after a bite or sting—especially with swelling or neurological symptoms—don’t wait. Seek medical care immediately, as time-sensitive interventions can be life-saving.