I manually opened the power lift gate of my 2024 Mercedes-Benz GLE 450. While loading items into the rear of the SUV, the power lift gate closed autonomously and without warning, striking me on the right side of my face and neck. No hands-free gesture was made. Key fob was secured in my purse (in shopping cart) at a distance and was not activated.The lift gate did not detect my presence and did not stop or reverse. The impact resulted in localized swelling and tenderness to my face/jaw area.