To describe a patient with right parietal lobe encephalomalacia who developed a striking postictal thoracocervicofacial purpuric rash and to review current literature regarding this presentation.

Postictal rashes are a rare, under-recognized finding, typically presenting as petechiae or purpura over the face, neck, and upper chest—the classic thoracocervicofacial distribution—after generalized tonic–clonic seizures. The eruption likely results from sudden increases in venous and intrathoracic pressure, causing dermal capillary rupture. Awareness of this benign and self-limiting entity is essential to prevent misdiagnosis as vasculitis or thrombocytopenia. Few well-documented cases exist in the literature.

A 48-year-old man with a history of traumatic brain injury, right parietal encephalomalacia, and chronic seizure disorder on brivaracetam presented after two witnessed generalized tonic–clonic seizures, one occurring during transport. Witnesses described upward gaze deviation, bilateral tonic extension, and postictal confusion lasting 15 minutes. On arrival, he was alert but agitated, with tachycardia and increased lactate levels. Head CT showed no acute changes. Within hours, a sharply demarcated petechial-purpuric rash appeared over the face, neck, anterior chest, and shoulders, sparing mucosa and lower extremities. Platelets and coagulation profile were normal; lumbar puncture was unrevealing. EEG demonstrated diffuse postictal slowing without epileptiform discharges. The eruption resolved spontaneously within 72 hours without treatment, paralleling the time course described in prior reports.

This case adds to limited literature on postictal petechial eruptions. The distribution, benign course, and normal hematologic workup support a mechanical etiology from transient venous hypertension rather than vasculitic or hematologic disease. Recognizing this pattern can prevent unnecessary testing and may serve as a clinical clue to recent convulsive activity, particularly in unwitnessed seizures or postictal states. Increasing recognition and reporting of these cases could clarify predisposing factors—such as seizure duration, position, or thoracic effort—and better define its incidence and prognostic significance.