Infections and other medical conditions
Some viral and bacterial infections can cause petechiae. In certain circumstances, a non-blanching rash may accompany a serious infection, including meningococcal disease, which can progress rapidly.
Other possible causes include inflammation of small blood vessels, immune-related conditions, and some disorders affecting the blood or bone marrow.
Because the causes vary widely, the spots cannot be reliably diagnosed from a photograph or home examination alone.
- When Are Tiny Purple Spots a Medical Emergency?
The most important question is not simply what the spots look like, but whether they are accompanied by symptoms suggesting a serious underlying problem.
Seek emergency medical care immediately if a new non-blanching rash occurs with any of the following:
Fever with severe headache, a stiff neck, or sensitivity to light
Confusion, unusual drowsiness, fainting, or difficulty waking
Trouble breathing, rapid deterioration, or severe weakness
Cold, clammy, or unusually pale skin, especially with dizziness or collapse
