II. Causes: Platelet Disorders

IV. Causes: Vascular Factors

  1. Congenital
    1. Hereditary Hemorrhagic Telangiectasia
      1. Autosomal Dominant
      2. Fragile telangiectasias of skin and mucus membranes
    2. Ehlers-Danlos Syndrome (Type IV)
      1. Skin hyperelasticity
      2. Joint hypermobility
      3. Fragile skin and blood vessels
  2. Acquired: Infections
    1. Henoch-Schonlein Purpura (HSP)
    2. Meningococcemia
    3. Rickettsial Disease
    4. Measles
    5. Scarlet Fever
    6. Typhoid
  3. Acquired: Medications
    1. Atropine
    2. Chloral Hydrate
    3. Long-term Corticosteroids
    4. Iodides
    5. Arsenicals
  4. Acquired: Trauma
    1. Violent coughing, Vomiting or strangulation
      1. Petechiae in the head and neck (above the nipple line)
    2. Factitious Purpura (linear Petechiae)
    3. Religious rituals (e.g. Cupping or coining)
    4. Child Abuse (Nonaccidental Trauma)
    5. Psychogenic Purpura (Gardner-Diamond Syndrome)
  5. Acquired: Other
    1. Vitamin C Deficiency (Scurvy)

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