<prompt> Petechiae in scurvy is due toPlatelet dysfunctionThrombocytopeniaClotting factor deficiencyEndothelial disintegration  <response>: Vitamin C deficiency causes defective formation of collagen with impaired healing of wounds, capillary haemorrhage and reduced platelet adhesiveness normal platelets are rich in ascorbate . Petechiae are formed due to minor bleeds from capillary vessels due to endothelial disintegration . Ref - Davidson 23e p716 