However, the location of the spots does not establish their cause.
New spots appearing across both legs, increasing in number, spreading toward the thighs, or developing on the arms or torso deserve particular attention. These patterns can occur for different reasons, including problems involving platelets, blood clotting, blood vessels, infections, or medications.
A rash that is spreading should not automatically be attributed to gravity, tight socks, or a long day of standing.
- What Can Cause Petechiae?
Petechiae develop when tiny blood vessels leak blood into the skin. Several different processes can lead to this, so the surrounding circumstances and any other symptoms matter.
Minor physical strain or pressure
Activities that place considerable strain on the body can sometimes cause small blood vessels to rupture.
Possible triggers include:
Repeated or forceful coughing
Intense vomiting
Heavy lifting or strenuous exertion
Significant local pressure or friction
When physical strain is responsible, the spots may be limited to a particular area, and the person may otherwise feel well. Nevertheless, a new or unexplained rash should not be assumed to have a harmless cause simply because physical activity occurred beforehand.
