This is because each spinal nerve root—one on each side of the body—services a specific area of skin called a dermatome. When a shingles outbreak occurs, only that dermatome on that side of the body ...
A shingles rash develops along a dermatome (an area of skin supplied by nerves from a single spinal root), which is why it usually appears as a stripe or band across the skin. This rash has a distinct ...