Purpura More Condition_symptoms In The Case Of Idiopathic Thrombocytopenia Purpura; Why Is The External Aspect "gravity Prone"?

In the case of idiopathic thrombocytopenia purpura; why is the external aspect "gravity prone"? - purpura more condition_symptoms

ITP impact of the internal organs. EGD is the diagnosis with the results of the purple in several places around the body. In the history of ITP, it was in the area susceptible to gravity (legs, feet, palms of hands. Buttock observed, etc. ..). How does this relate to the internal system.