You see a small, itchy patch on your skin. At first, you think it’s nothing. Maybe it’s a bug bite or a small rash. But then it begins to burn, tingle and small blisters form.
You’ve heard of shingles before, but you assumed it would stay in one spot. Most of the time, that’s true. Shingles usually appears in a single stripe of painful blisters on one side of the body.
What if the rash doesn’t stay in one spot? What if new blisters appear on different parts of your body? That’s when shingles can become more serious. This rare and dangerous form is called disseminated shingles.
Read on to learn more about disseminated shingles, what causes the rash to spread, how it’s treated and steps you can take to prevent it.
What causes shingles?
Shingles, or herpes zoster, happens when the varicella-zoster virus, the same virus that causes chickenpox, reactivates in your body years later.
After you recover from chickenpox, the virus doesn’t go away completely. It stays hidden in your nerve cells and can stay there (dormant) for many years.
What is disseminated shingles?
“Shingles typically begins in one or two areas of skin (called dermatomes) connected to nerves near the face, throat, chest and nearby areas," said Mounika Addula, MD, an internal medicine specialist with Banner Health. “In people with weaker immune systems, shingles can spread to other parts of the body and sometimes even affect internal organs.”
Disseminated shingles is when 20 or more blisters appear outside the original rash area. The blisters can show up on both sides of the body, on the face or even on the scalp.
In rare cases, the virus can travel through the bloodstream and affect the lungs, liver or brain. When this happens, shingles becomes a medical emergency.
Who is at risk?
Disseminated shingles doesn’t usually happen in healthy people. Most people who get shingles have it in only one area and recover within a few weeks.
However, certain risk factors can raise your risk for disseminated shingles, including:
- Weakened immune system from conditions like cancer, HIV/AIDS or autoimmune disease
- Chemotherapy or radiation therapy
- Long-term use of steroids or immunosuppressive medications
- Older age (especially over 60)
- Chronic illnesses like diabetes or kidney disease
Your immune system normally keeps the virus quiet (dormant). But when your body is under stress or your defenses are low, the virus can spread more easily. That’s why it’s most common in people with weak immune systems.
What disseminated shingles looks like
At first, disseminated shingles can look like regular shingles. You might feel:
Itching, tingling or pain several days before a rash appears
A painful rash with fluid-filled blisters that itch or tingle
But when the condition spreads, it can worsen quickly. Dr. Addula said to look for these warning signs:
- New rash areas that appear away from the first spot
- Fever, chills or body aches
- Headache or fatigue
- Confusion or neurological symptoms if the brain is affected
- Cough, chest pain or shortness of breath if it spreads to the lungs
If your shingles rash spreads or you start to feel sick, call your health care provider right away or go to the emergency room. Disseminated shingles can lead to serious complications if left untreated.
Possible complications
Because the virus can travel through the bloodstream, it poses greater risks than localized shingles. Possible complications include:
- Pneumonia (lung inflammation)
- Hepatitis (liver inflammation)
- Encephalitis (brain inflammation)
- Vision problems if the eyes are affected
- Postherpetic neuralgia, a condition where pain lingers long after the rash heals
How is disseminated shingles treated?
While most shingles cases can be managed at home, disseminated shingles often requires:
- Antiviral medications through an IV (such as acyclovir, valacyclovir or famciclovir) to stop the virus from spreading
- Hospitalization for close monitoring
- Wound care to prevent secondary infections
- Treatment for any complications affecting your organs
- Pain management with medications or topical treatments
- Supportive care for symptoms such as fever, fatigue or dehydration
Early treatment of disseminated shingles can make a difference in recovery and prevent serious problems.
“Timing is very important, especially if you are at high risk,” Dr. Addula said. “Antiviral therapy should be started as soon as possible, ideally within 72 hours of rash onset.”
If you are experiencing symptoms, get help right away.
What recovery looks like
Recovery can take longer with disseminated shingles than for those with localized shingles.
“The rash may keep coming back and take longer to heal,” Dr. Addula said. “Even after the rash heals, you may experience lingering fatigue or nerve pain.”
Stay in close contact with your health care team and let them know if pain continues or impacts your daily life. Treatments are available to help manage it.
How to prevent shingles and its spread
1. Get vaccinated
The best protection against shingles and its complications is the Shingrix vaccine.
“Vaccination is the cornerstone for prevention,” Dr. Addula said. “We strongly recommend all adults 50 and older – and immunocompromised people 19 and older – get vaccinated with the recombinant zoster vaccine (RZV).”
The vaccine is given in two doses, two to six months apart. It can lower your chance of getting shingles by more than 90%. Even if you had shingles before, the vaccine can stop another case.
“If you are about to start immunosuppressive therapy or are on a transplant list, discuss the RZV vaccine with your health care provider,” Dr. Addula said. “It’s one of the best ways to reduce risk before treatment starts.”
Learn more about adult vaccinations.
2. Manage your health conditions
If you have a chronic illness or weakened immune system, follow your provider’s recommendations for managing your health. Keeping your immune system strong helps your body control viruses that may try to reactivate.
Eat a balanced diet, get enough sleep, manage stress and stay active as your condition allows.
3. Avoid contact with others when you have shingles
If you do develop shingles, you can spread the chickenpox virus (not shingles itself) to people who’ve never had chickenpox or haven’t been vaccinated.
Avoid direct contact with babies, pregnant people and anyone with a weakened immune system until your blisters have crusted over.
4. Don’t ignore symptoms
If you notice new or worsening rash, pain or fatigue, contact your health care provider. Early antiviral treatment can make a big difference in preventing shingles from spreading or becoming severe.
The bottom line
Most cases of shingles are mild and localized to one area. Disseminated shingles can be serious, especially if you have a weakened immune system.
If you think you may be at risk or notice a new rash, talk to your health care provider or a Banner Health specialist right away. Early care can make all the difference.
