What condition could cause my aunt's eye to get swollen and mouth turned sideways?

Bell"s palsey: Bell's palsy is a form of facial paralysis resulting from a dysfunction of the cranial nerve vii (the facial nerve) that results in the inability to control facial muscles on the affected side. Several conditions can cause facial paralysis, e.g., brain tumor, stroke, and lyme disease. However, if no specific cause can be identified, the condition is known as bell's palsy.