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Rare chickenpox scar turns into massive keloids

Ars Technica •
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A teenage patient developed unusually large, rubbery nodules after a routine chickenpox infection. What began as itchy blisters proliferated into keloids that far exceed normal scar tissue. Doctors attribute the abnormal response to an overactive proliferative phase, where fibroblasts lay down excess collagen, turning ordinary lesions into persistent, raised masses. Such cases are rare, prompting dermatologists to monitor post‑varicella scarring more closely.

Healing normally proceeds through inflammatory, proliferative and maturation stages. In the proliferative stage, fibroblasts synthesize collagen to scaffold new tissue. In keloids these cells survive longer and crank out up to twenty times more collagen than typical skin, creating a hyper‑proliferative environment. Researchers suspect varicella‑induced inflammatory signals may tip the balance, especially in individuals with darker skin tones, highlighting urgency for genetic studies.

Treating keloids is notoriously difficult; surgical excision recurs in 45‑100 % of cases, while cryotherapy, laser or radiation carry side effects. Corticosteroid injections remain the primary palliative, easing itch and pain. The teenager chose to avoid aggressive therapy, managing symptoms with antihistamines and acetaminophen. Since the varicella vaccine’s 1995 rollout, 97 percent efficacy has driven chickenpox cases—and related complications—down sharply. Boosting coverage remains essential for community protection.