What are considered 1-2mm hemorrhages on the skin?

Petechiae are defined as small, pinpoint hemorrhages that measure between 1-2 millimeters in diameter. They can appear on various parts of the body, including the skin and mucous membranes, and are often caused by various underlying conditions such as platelet disorders, certain infections, or trauma. Their small size distinguishes them from other forms of bleeding.

Purpura, on the other hand, consist of larger areas of bleeding, typically greater than 3 millimeters but less than 1 centimeter in diameter, and usually indicate a more significant underlying vascular or blood-related issue. Ecchymoses are larger bruise-like areas of bleeding that often exceed 1 centimeter, resulting from trauma or bleeding disorders. Hemothorax refers to blood accumulation in the pleural cavity, which is an entirely different clinical condition unrelated to skin hemorrhages.

Understanding the size and context of these hemorrhagic lesions helps in diagnosing and identifying potential hematological or systemic conditions.