• Prodrome: Initial or early symptom/s indicating the onset of a disease or illness
• Dermatome: An area of sensory nerves near the skin that are supplied by a specific spinal nerve root
• Retina: The layer at the back of the eyeball that contains cells sensitive to light, critical for vision
• Palsy: Paralysis or muscle weakness especially when accompanied by tremors
• Cornea: The transparent layer forming the front of the eye, important for vision
• Lymphoma: It is a cancer of the lymphatic system
• Tinnitus: Ringing or buzzing in the ears
• Necrosis: Death of the cells, tissue or an organ due to disease, injury or failure of blood supply
• Neuritis: Inflammation of a peripheral nerve or nerves causing pain and loss of function
• Immunocompromised: Having an impaired immune system
• Cutaneous: Related to the skin
• Vesicular: Fluid-filled
• Paroxysmal: Marked by a sudden but periodic increase in symptoms