What are the differences among petechiae, ecchymosis, and purpura?
Feb 09, 2023
Source: Cainiu Health
Dr. Liu Wan
Introduction
The differences between petechiae, ecchymoses, and purpura lie in aspects such as size, shape, color changes, duration, and underlying causes. Petechiae are very small bleeding spots, typically less than 3 mm in diameter; ecchymoses are larger and may cover a broader area; purpura are even larger, usually exceeding 3 mm in diameter. If any of these conditions are present, it is advisable to consult a doctor promptly for professional evaluation and diagnosis.
Petechiae, ecchymoses, and purpura differ in terms of size, shape, color changes, duration, causes, and other aspects.
1. Size: Petechiae are very small bleeding spots, typically less than 3 mm in diameter; ecchymoses are larger and may cover a broader area; purpura are even larger, usually exceeding 3 mm in diameter.
2. Shape: Petechiae are typically round and regular in shape; ecchymoses may appear irregular; purpura can also be irregular but are generally larger and more prominent.
3. Color changes: Petechiae are usually red or purple and do not fade; the color of ecchymoses changes over time, evolving from red or purple to green or yellow; purpura are typically purple or dark red.
4. Duration: Petechiae last a short time, usually resolving within several days to about one week; ecchymoses last longer, often taking several weeks to fully disappear; purpura may also persist for an extended period and require more time to resolve.
5. Causes: Petechiae are commonly caused by thrombocytopenia or abnormal blood coagulation; ecchymoses primarily result from skin injury or trauma causing blood vessel rupture; purpura may be associated with platelet dysfunction, weakened blood vessel walls, or deficiencies in clotting factors.
If any of these conditions occur, it is recommended to consult a doctor promptly for professional evaluation and diagnosis.
