<prompt> Causes of Bells palsy include all EXCEPTHIVDiabetes mellitusMultiple sclerosisFrontal sinusitis  <response>: D Frontal sinusitis CAUSES OF BELLS PALSY Herpes virus Herpes simplex virus HSV, including either herpes type 1 HSV-1, which causes cold sores, or herpes type 2 HSV-2, which causes genital herpes Varicella-zoster virus, which causes chickenpox and shingles Varicella-zoster virus is a less common cause of Bells palsy than the herpes simplex virus, but can lead to the more serious condition called Ramsay Hunt Syndrome. Other viruses Lyme disease Syphilis Epstein-Barr virus - which causes glandular fever Cytomegalovirus Other risk factors Diabetes HIV are thought to be at a higher risk of developing Bells palsy, although the reason for this is not fully understood. Facial nerve damage can also be caused by progressive nerve diseases such as multiple sclerosis. High blood pressure; Trauma; Toxins Lyme disease Guillain-Barre syndrome Sarcoidosis Myasthenia gravis Infection 