Petechiae After Scratchingprivacy - จด งาน แตง รม ทะเล Pantip What is a petechial (non blanching) rash? This is a rash that does not fade under pressure. The “glass test” is a way to identify this type of rash. When a clear glass is pressed firmly against. Petechiae are typically not brought on by itching or other trauma, they occur spontaneously and are an indicator of a very low platelet count.
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