what is the difference between petechiae and ecchymosis

shruti

Member
Petechiae and Ecchymoses are two very confusing terms. But they can be differentated on the basis of their size. Spontaneous bleeding into the skin generally appears as a rash known as purpura.

Petechiae is the term used for the individual that has small red or red-blue spots about 1 to 5mm in diameter. Petechiae is caused by a small local amount of bleeding within the skin. Ecchymoses is the term defined for bleeding beneath the skin that may cause bruises.

The main difference between petechiae and abnormal blood vessels can be depicted by applying pressure to a red spot. If it is caused by an abnormal blood vessel the redness disappears for some time. Whereas when pressure is applied to purpura the spots do not become pale.
 

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