Itchy, raised, rash first appearing near buttocks, thighs, bottom of forearms, and back of calves in PM of 26Jan2025. OTC Hydrocortisone cream applied to affected areas to limited effect. After 12 hours, spread to lower torso, middle of back, under chin, behind ears, and face. Received script for children’s cetirizine and prednisolone following visit to urgent care in AM of 27Jan2025 following symptom presentation which was filled in PM. Administered single dose of cetirizine, but child was unable to tolerate (vomiting) prednisolone as it was a liquid adult formulation and not compounded for child use. Visit to ER in PM of 27Jan2025 suggested delayed reaction to vaccines received on 21Jan2025.