As a hematologist, I specialize in the study and medical treatment of the blood, blood-forming organs, and blood diseases. When it comes to the formation of blood spots, also known as petechiae, there are several potential causes.

Blood spots are small, round, red or purple marks on the skin that are caused by bleeding into the skin. They are typically less than 2 millimeters in diameter and can occur for various reasons:


1. Minor trauma: Even a slight injury to the skin can cause blood spots if the capillaries (small blood vessels) are damaged.

2. Increased vascular fragility: Conditions that make the blood vessels more fragile, such as autoimmune diseases or certain medications, can lead to petechiae.

3. Thrombocytopenia: A low platelet count can result in blood spots. Platelets are essential for blood clotting, and when their numbers are low, bleeding can occur more easily.

4. Coagulopathies: Disorders that affect the body's ability to form clots can also lead to petechiae. These can be due to genetic conditions or acquired diseases.

5. Infection: Certain infections, like meningitis or sepsis, can cause blood spots due to the inflammatory response and the associated damage to blood vessels.

6. Severe allergic reactions: In some cases, anaphylaxis can cause blood spots due to the release of histamine, which increases vascular permeability.

It's important to consult with a healthcare professional if you notice blood spots, as they can be a sign of an underlying medical condition that requires attention.

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Sudden unexplained bruising or blood spots under the skin or a sudden increase in the frequency of bruising may be caused by: A medicine, such as aspirin or blood thinners (anticoagulants). Infection that causes the buildup of toxin in the blood or tissues (sepsis).read more >>