Sometimes a bandaid covers more than a scrape. Sometimes it covers a bigger story—one about misdiagnosis, fear, and the high stakes of misunderstanding Lyme disease in children.

Although uncommon, Lyme disease misdiagnosed as child abuse highlights how atypical presentations of tick-borne illness can create serious diagnostic confusion.

That’s what happened in a case reported by Dr. Pan and colleagues in the journal Case Reports in Orthopedics (2021). A young boy’s swollen knee, fracture, and skin lesion were misinterpreted as signs of child abuse—when in reality, he had Lyme disease.

In children, Lyme disease may present in ways that differ from classic textbook descriptions. Joint swelling, fatigue, neurologic symptoms, or unusual rashes may appear without a clear history of tick bite. These patterns are discussed more broadly in the Lyme disease symptoms guide.

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The Case: When Lyme Disease Mimics Trauma

A 4-year-old boy was evaluated after an unwitnessed fall while playing outdoors. His pediatrician noted:

1. A greenstick fracture of the radius
2. A swollen right knee with mild tenderness
3. A large “bruise” on the buttock

Out of caution, and without a clear account of what had happened, the physician reported the incident to County Social Services for possible non-accidental trauma (NAT). The child was placed in foster care, and the case was investigated as suspected abuse.

But as Pan and colleagues later wrote, a closer examination by an orthopedic specialist changed the trajectory:

“What was initially interpreted as a large bruise on the buttock was in fact a bull’s-eye rash—erythema migrans.” — Pan et al.

The child’s Lyme disease test came back positive, and he was treated with a 30-day course of oral amoxicillin. His symptoms improved. Five days later, the child was returned to his family, and the investigation was closed.

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What Pan et al. Want Us to Learn

The authors caution that increased awareness of child abuse, combined with incomplete clinical evaluation, may occasionally lead to diagnostic errors.

“Less than 1 in 7 cases reported by professionals end up as confirmed abuse.” — Pan et al.

This is not an argument against mandated reporting. Protecting children is essential. But the case underscores the importance of thorough medical evaluation before conclusions are drawn.

When Lyme disease is misinterpreted as trauma, the consequences may include unnecessary family separation and emotional distress.

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Lessons for Clinicians: A Deeper Look

Cases like this illustrate several important clinical principles.

1. Recognize Non-Traumatic Joint Swelling in Children

Lyme arthritis often presents as painless or minimally tender swelling, especially in the knee.

• It may occur without fever.
• Inflammatory markers may be normal.
• Swelling may appear episodic or migratory.

These patterns are common in pediatric Lyme disease.

2. Don’t Rely on Tick Bite History

In many pediatric cases, parents never saw a tick.

Ticks frequently attach:

• behind the knee
• in the scalp
• along the waistband

The absence of a known tick bite does not rule out Lyme disease, particularly in endemic regions.

3. Learn to Identify Atypical Rashes

Erythema migrans does not always look like a textbook bull’s-eye.

In children it may appear:

• faint or bruise-like
• solid red or purple
• located in unusual areas such as the buttock or groin

Clinicians should carefully distinguish bruising from rashes when joint symptoms or systemic complaints are present.

4. Assess Environmental Risk

A brief environmental history can provide important clues. Ask whether the child:

• plays in wooded or grassy areas
• lives near deer or wildlife
• has pets that go outdoors

Tick exposure may occur even in suburban environments.

5. Avoid Premature Diagnostic Closure

When injuries occur without a clear witness, trauma may seem like the most likely explanation. But clinicians should remain open to other possibilities.

Medical causes that may mimic trauma include:

• infections such as Lyme disease
• inflammatory joint conditions
• dermatologic conditions resembling bruising

Maintaining a broad differential diagnosis helps prevent diagnostic error.

6. Coordinate with Specialists Carefully

When orthopedics, pediatrics, or emergency medicine are involved, clear communication is important.

Specialists evaluating fractures or joint swelling may initially focus on trauma. Infectious causes such as Lyme disease should remain part of the diagnostic discussion in endemic regions.

7. Support Families During Diagnostic Uncertainty

Parents seeking care for a child with unexplained symptoms often feel frightened and confused. Clear communication and careful medical evaluation are essential to maintaining trust.

When symptoms such as joint swelling, fatigue, or unusual rashes appear, Lyme disease should remain part of the differential diagnosis in appropriate geographic settings.

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Proposed Treatment When Lyme Disease Is Confirmed

When Lyme disease is identified in a young child, treatment typically involves oral antibiotics.

Common first-line therapies may include:

• Amoxicillin
• Cefuroxime axetil
• Doxycycline (generally for children ≥8 years old)

Treatment duration varies depending on the clinical presentation but often ranges from 14 to 30 days for early Lyme disease or Lyme arthritis.

Most children respond well to therapy, with gradual improvement in joint swelling and other symptoms.

More information about diagnostic evaluation can be found in the Lyme disease testing and diagnosis guide, and the expected clinical course is discussed in the Lyme disease recovery hub.

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When Lyme Disease Is Misinterpreted as Trauma

Parents of children with Lyme disease sometimes struggle to explain symptoms that seem unusual or inconsistent. A child may appear:

• limping
• fatigued
• irritable
• withdrawn

Without careful evaluation, these signs may be misunderstood.

This case reminds clinicians to consider medical explanations alongside trauma when evaluating unexplained symptoms in children.

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Final Thought: A Case That Highlights Diagnostic Complexity

This child ultimately received the correct diagnosis—but only after significant distress for the family.

Cases like this remind us to:

• keep Lyme disease in the differential diagnosis
• recognize its diverse pediatric presentations
• approach complex cases with careful clinical reasoning

In endemic regions, Lyme disease remains an important—and sometimes unexpected—cause of joint swelling and unusual rashes in children.

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Reference

Pan T, Nasreddine A, Trivellas M, Hennrikus WL. Lyme Disease Misinterpreted as Child Abuse. Case Reports in Orthopedics. 2021;2021:6665935. https://doi.org/10.1155/2021/6665935

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