Common characteristics include:
Small, pinpoint marks: Individual spots are usually very small, although clusters may look like a larger discolored patch.
Red, purple, or brown coloring: The exact appearance can vary depending on the skin tone and how long the spots have been present.
Flat skin: The affected area usually feels smooth rather than swollen.
Little or no fading under pressure: Petechiae generally do not blanch, meaning their color does not disappear when pressure is applied.
Petechiae may be easier to notice on the ankles, feet, and lower legs, but they can develop anywhere on the body.
Importantly, not every small purple spot is petechiae. Other skin conditions can look similar, and appearance alone cannot establish the cause.
- How to Check Whether the Spots Fade Under Pressure
One feature that can help distinguish petechiae from certain inflammatory rashes is whether the spots blanch when pressed.
You may hear this described as a blanching test or a glass test. Although it can provide a useful observation, it cannot determine whether the condition is dangerous.
