You can take, ultrasound of the swelling. If it is mild swelling, nothing to worry

go for ultrasound to know what swelling it is and for right treatment

Swelling could be because of recovery. please get done USG Neck

This swelling could be numbness or tingling sensation which indicates that nerve is in recovery..

Hi, I am Atul Kumar Nimawat MS ENT. Bell’s palsy often begins with pain around the ear due to inflammation of the facial nerve as it passes through a narrow bony canal. The swelling or nerve discomfort your sister is feeling could be due to ongoing nerve inflammation or mild fibrosis during healing. This can persist even as facial function improves. It’s a good sign that facial movements are returning. However, nerve recovery can take time—sometimes up to 3 months or longer.