Bleeding disorders caused by abnormalities of the vessel wall develop due to vascular malformation or damage. They are associated with cutaneous or mucosal flat or palpable purpura.
Of note, the commonly used but nonspecific word “purpura” is usually used to describe subcutaneous bleeding, which may be related to blood vessel wall abnormalities (described here) or platelet abnormalities.
1. Inherited vascular purpuras:
1) Hereditary hemorrhagic telangiectasia (Osler-Weber-Rendu disease).
2) Purpura associated with congenital connective tissue diseases: Ehlers-Danlos syndrome, Marfan syndrome, osteogenesis imperfecta.
2. Acquired vascular purpuras:
2) Purpura caused by elevated venous pressure: Small, point-like petechiae on the face and upper trunk, which may be caused by cough, vomiting, interpersonal violence, or lifting heavy objects, may develop in women after delivery, or may appear on the lower extremities due to venous stasis.
3) Senile purpura.
4) Purpura caused by Cushing syndrome.
5) Ascorbic acid deficiency (“scurvy”).
7) So-called simple purpura (mild purpura occurring in young women, which exacerbates during menstruation and is probably related to female sex hormones).
8) Purpura related to trauma or sunburn.
9) Purpura associated with infection: This is usually due to meningococcal, streptococcal, Salmonella spp, or other rare bacterial infections such as Capnocytophaga canimorsus, Pasteurella multocida, varicella-zoster virus, influenza virus, measles virus, or malaria. It may also develop in patients with gram-negative sepsis, for instance, Waterhouse-Friderichsen syndrome, pneumococcal sepsis, endocarditis, purpura fulminans (a rapid severe purpura in the course of infections, which initially manifests as fever, rigors, massive symmetric purpura on the lower extremities and trunk, and progresses to bullous and necrotic lesions that may lead to gangrene or even autoamputation of fingers). The risk of such infections is increased significantly by splenectomy, functional hyposplenism, or the use of selected medications, such as eculizumab.
10) Purpura related to thromboembolism: Hemorrhagic and necrotic lesions in patients with disseminated intravascular coagulation (DIC), heparin-induced thrombocytopenia, cutaneous necrosis caused by vitamin K antagonists, antiphospholipid syndrome, embolism caused by atherosclerotic plaques, severe hereditary deficiency of protein C, and warfarin-associated skin necrosis/peripheral gangrene.
11) Drug-induced purpura: Purpura located mainly on the skin of the trunk and extremities. It appears after several days to over 2 weeks of administration of certain drugs (eg, allopurinol, cytarabine, atropine, barbiturates, quinidine, phenytoin, isoniazid, methotrexate, morphine, naproxen, nitrofurantoin, penicillins, piroxicam, sulfonamides, iodine) and disappears within several days of their discontinuation.