Petechiae in immune thrombocytopenia (ITP)

Petechiae in a man with immune thrombocytopenia (ITP).
(A) Dense, cutaneous petechiae on the foot and ankle. There are no petechiae on the sole of his foot, a site at which the vessels are protected by the strong subcutaneous tissue.
(B) Occasional petechiae on the patient's face and large, bullous hemorrhages on the buccal mucosa, which are related to the lack of vessel protection by the submucosal tissue. Similar petechiae and hemorrhagic bullae can be seen in patients with thrombocytopenia of any cause.