Before the rash appears, the area of affected skin will itch intensely. A poison ivy rash may take 2–3 weeks to appear after contact with the plant if the person has not previously had a reaction. Poison ivy: A person can develop a blistering rash on the area of skin that comes into contact with the plant. ![]() A person with lichen planus can develop blisters, but these are rare. They often appear on the lower back and can also commonly affect the wrists and ankles. Lichen planus: This is a skin condition that causes shiny, firm bumps.Shingles is not the only cause of a rash on the back. Other causes of back rash that appears similar to shingles The varicella-zoster virus travels along these nerve pathways, and the shingles rash usually appears in one or two adjacent dermatomes.Ī shingles rash tends to center in one dermatome, but there may be odd blisters in an adjacent area if the branches of the spinal nerve cross into a different zone. ![]() While each dermatome is associated with a single spinal nerve, there is some overlap between the zones. Each nerve cell is associated with a particular area of skin called a dermatome. There are 31 spinal nerve cells on each side of the body that branch out to send and receive sensations from the skin. The National Institute on Aging explains that after a chickenpox infection, the varicella-zoster virus moves from the skin to nerve cells in the spine. How does the rash spread across the body? This is because it can affect the eye and result in vision loss. If the rash develops on the face, people should contact a doctor urgently. In those with weakened immune systems, the rash may be more widespread across the body. The rash typically begins on one side of the body or face in a small area.Īlthough it most commonly develops as a single stripe around one side of a person’s waistline, it can begin anywhere on the body. ![]() Where would a shingles rash typically begin?
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