Final answer:
Bilateral Bell's palsy is a condition characterized by paralysis or weakness of the facial muscles on both sides of the face. It is rare and its underlying cause is often unknown, but it can be associated with certain medical conditions.
Step-by-step explanation:
Bell's palsy is a condition characterized by paralysis or weakness of the muscles on one side of the face. It is typically caused by damage or inflammation of the facial nerve. When the condition affects both sides of the face, it is known as bilateral Bell's palsy. This is a rare occurrence, and its underlying cause is often unknown. However, it can be associated with certain medical conditions such as Lyme disease, viral infections, and autoimmune disorders.