Potential Causes: From Benign to Serious
While sometimes caused by minor trauma or straining, their sudden appearance can indicate:
1. Vascular Inflammation & Weakness
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Vasculitis: Inflammation of blood vessels, which weakens their walls. This can be related to autoimmune disorders.
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Chronic Venous Insufficiency (CVI): Poor blood flow in the veins, often linked to varicose veins, swelling, and achy legs. The pressure can cause capillaries to burst.
2. Blood Clotting Disorders
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Low Platelet Count (Thrombocytopenia): Platelets help your blood clot. A low count leads to easy bruising and petechiae. This can be caused by infections, medications, or autoimmune diseases.
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Vitamin Deficiencies: Severe deficiencies in Vitamin C (scurvy) or Vitamin K can impair collagen and clotting, leading to petechiae.
3. Serious Infections
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Bacterial Meningitis: A medical emergency. Petechiae with a fever and stiff neck requires immediate ER care.
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Viral Infections (like CMV, Epstein-Barr): Can temporarily affect platelet counts.
4. Medication Side Effects
Blood thinners (aspirin, warfarin), steroids, and some antibiotics can cause increased bleeding and petechiae.