Atypical Lyme Rash in Children: A Case That Evolved Over Time
In children, they can evolve over days.
And early signs are often missed.
Atypical Lyme rash children can make early diagnosis challenging—especially when the rash does not resemble the classic bull’s-eye pattern.
Case reports highlight how Lyme disease may present in unexpected ways. In a report by Banadyha and colleagues, an 11-year-old girl developed multiple evolving rashes before a classic erythema migrans lesion appeared.
Early Symptoms Did Not Suggest Lyme Disease
The child was admitted with fever, headaches, abdominal pain, and a progressing rash.
Her illness began with a small rash on her left foot that resolved with topical treatment.
Shortly after, a second rash appeared on her right foot and also disappeared after antihistamine therapy.
Clinical challenge: early rashes were transient and did not raise suspicion for Lyme disease.
Rash Progression Over Several Days
By the fourth day of illness, a maculopapular rash appeared on the trunk and limbs.
Over the following days:
- The rashes enlarged
- Fever and lethargy developed
- Headaches and abdominal pain worsened
Initial diagnoses included other conditions such as toxic erythema.
Clinical pattern: evolving, migratory rashes can delay recognition of Lyme disease.
Diagnosis Delayed by Atypical Features
The child’s parents did not recall a tick bite.
Lyme disease was not initially suspected because symptoms began during a colder season.
Key issue: absence of tick exposure and seasonality can lower clinical suspicion.
The Classic Rash Appears Late
Only on the seventh day of illness did a typical erythema migrans lesion appear on the chest.
At that point, Lyme disease became more apparent.
Serologic testing confirmed the diagnosis of early disseminated Lyme disease.
The child was treated with doxycycline and recovered.
Why This Case Matters
The authors noted that the rash was extensive, multiple, and migratory—features that differ from the classic presentation.
Clinical takeaway: Lyme rash in children may not appear typical early in the illness and can evolve over time.
Recognition often depends on observing the progression of symptoms rather than relying on a single early finding.
Clinical Takeaway
Atypical Lyme rash children may lead to delayed diagnosis when early symptoms do not match the expected pattern.
Clinicians should consider Lyme disease when rashes are evolving, migratory, or associated with systemic symptoms—even without a known tick bite.
Key question: Could an unusual or changing rash be an early sign of Lyme disease?
For more, see Giant erythema in a child with Lyme disease.
For early symptoms, visit Early signs of Lyme disease in children.
For rash variations, see Erythema migrans does not always have a bull’s-eye appearance.
Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.
Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention
