Answer:
Paralysis of facial muscles on one side of the face is called "facial paralysis" or "hemifacial paralysis". It can be caused by a variety of factors, including infection, injury, stroke, or neurological conditions such as Bell's palsy. Symptoms may include drooping of the face, difficulty closing the eye on the affected side, drooling, and difficulty with speech or eating. Treatment options depend on the underlying cause and severity of the paralysis, and may include medications, physical therapy, surgery, or other interventions.