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.

18. Intense Weightlifting or Physical Exertion

Believe it or not, pushing your body too hard at the gym can lead to petechiae. During extreme exertion—like lifting heavy weights, performing max-effort squats, or holding your breath while straining—you can break small capillaries, especially in the face, neck, and upper chest. This is often seen in powerlifters and athletes after intense competition. Known as “effort petechiae,” the spots are harmless but serve as a reminder to breathe properly and avoid overstraining. If the marks persist or appear without physical exertion, however, it’s worth exploring other medical causes.