Percutaneous Electrical Nerve Field Stimulation (PENFS) in Patients With Post Concussion Syndrome (PCS)

Concussion: Inclusion Criteria: * Clinical diagnosis of Post-Concussion Syndrome * Post-Concussion Symptoms for at least 3 months along with lack of other explanation for their symptoms * English and Spanish-speaking families Exclusion Criteria: * Seizure disorders * Significant developmental delay * Infection or severe dermatological condition of ear * Bleeding disorders * Implanted electrical device COVID: Inclusion Criteria * Child is in between the ages 11-18 * Child is present at CHOC Neurology clinic post covid-19 symptoms of more than 3 months duration along with lack of other explanation for their symptoms * English-speaking and Spanish-speaking families You cannot participate in this study if you meet the following exclusion criteria: * Children with significant developmental delay, infection or severe dermatological condition of ear, bleeding disorders, or having any implanted electrical device will be excluded. * Are not able to attend Friday appointments for the Neurostim placements.