Herpes Zoster Scars: Why They Happen and How to Prevent Them
"Uncover the surprising link between shingles and skin scarring, and learn how early treatment can make a difference."
Chickenpox, caused by the varicella-zoster virus (VZV), often leaves behind cutaneous scars, affecting about 20% of children. But what about herpes zoster, also known as shingles, which is caused by the same virus reactivating later in life? Surprisingly, skin scars from shingles aren't as widely discussed, and the risk factors for post-herpes zoster scarring remain unclear.
A recent study aimed to change that by prospectively investigating the incidence and risk factors for scarring after herpes zoster. The study followed patients with herpes zoster at a tertiary university hospital over three years, collecting data on age, sex, immune status, prior scarring history, severity and extent of the herpes zoster infection, affected dermatome (the area of skin supplied by a single spinal nerve), and antiviral treatment received.
The findings shed light on why some people develop scars after shingles and, more importantly, how to potentially prevent them. This article delves into the study's results, offering insights and actionable advice to help you protect your skin after a shingles outbreak.
Conventional Understanding and Its Limits
The term “herpes zoster” was first used by encyclopedist Celsus between approximately 25 BCE and 50 AD. In 1888, James von Bokay observed the relationship between varicella and herpes zoster when children who had never had chickenpox developed varicella after contact with someone with shingles. Modern treatment guidance remains important because shingles affects approximately 1 million Americans annually, while clinical references note that many proposed therapeutic approaches are likely ineffective.
What the Research Reveals About Scarring After Shingles
The study, conducted over three years, included 113 herpes zoster patients who were monitored for scar formation six months after their skin lesions healed. The results indicated that 9.7% of these patients developed post-herpes zoster scarring. These scars varied in appearance, including hypopigmented (lighter than the surrounding skin), hyperpigmented (darker than the surrounding skin), atrophic (sunken), and hypertrophic (raised) scars.
- Severity of Herpes Zoster: Extensive and severe herpes zoster infections were more likely to result in scarring.
- Immunosuppression: A significant number of patients who developed scars were immunocompromised, suggesting a weakened immune system increases the risk.
- Previous Scarring History: Patients with a history of hypertrophic or keloid scarring were more prone to developing scars after herpes zoster, although they did not have prior varicella scars.
Emerging Evidence
A published case report described a 76-year-old patient who developed keloids at the site of a previous herpes zoster outbreak, documenting a rare scarring pattern known as Wolf’s isotopic phenomenon. A systematic literature review found that reported postherpetic neuralgia incidence varied widely, from 2.6% to 46.7% in the general population. The review also reported different ranges among immunocompromised patients, people with depression, and people with HIV, highlighting substantial variation across populations and diagnostic settings.
What the Evidence Misses
Scarring after herpes zoster is probably overlooked, according to a report indexed by Europe PMC. That concern is consistent with coverage describing shingles scars as often overlooked compared with the more commonly recognized scars of chickenpox. The available material also identifies severe infections and immunosuppression as risk factors discussed in relation to lasting marks, but it does not establish a single scarring rate.
Taking Action: Preventing Scars After Herpes Zoster
The study underscores that scarring after herpes zoster is likely more common than previously thought. The good news is that there are steps you can take to minimize your risk. Prompt initiation of antiviral treatment for herpes zoster is crucial to reduce the severity of the infection and, consequently, the likelihood of scarring. Furthermore, herpes zoster vaccination can significantly decrease the severity and incidence of herpes zoster, thus reducing the potential for scarring. Talk to your doctor about whether the herpes zoster vaccine is right for you, especially if you are over 50 or have a weakened immune system.
Long-Term Outlook
Shingles is described as reactivation of the varicella-zoster virus in sensory nerves, producing a painful, blistering rash in a dermatomal distribution. The cited prognosis source identifies postherpetic neuralgia as a common and debilitating long-term complication. These features make recovery and longer-term symptom management important parts of the future outlook after an outbreak.