Diagnosis: Erythema multiforme (mycoplasma-associated)
A 15-year-old male presents with target lesions on the hands following a recent respiratory illness characterized by cough and fever. His clinical findings are consistent with a diagnosis of erythema multiforme, likely associated with Mycoplasma pneumoniae infection. This case highlights the importance of recognizing the clinical features of this condition in a pediatric population.
A 15-year-old male presents with a 1-week history of cough and fever, followed by the sudden onset of target-shaped lesions on his hands. On examination, the lesions are well-defined, with central vesicles and erythematous halos, predominantly affecting the dorsal surfaces of the hands. No mucosal involvement is noted.Age: 15 yearsSex: MaleDuration: 1 weekKey complaint: Target lesions on handsExam findings: Central vesicles with erythematous halos
The patient reports that the cough and fever began approximately 10 days prior to the appearance of the skin lesions. He has no significant past medical history and no known drug allergies. His family history is unremarkable for dermatologic or autoimmune disorders. He has had recent close contact with peers experiencing respiratory infections. No recent travel or exposure to new medications was reported.Onset: 10 days prior to skin lesionsTriggers: Recent respiratory illnessPrior treatments: None for skin lesionsRelevant history: No significant past medical historyFamily history: Unremarkable
Acute / First-Line ManagementSupportive care including hydration and analgesics for pain relief.Topical corticosteroids may be applied to affected areas to reduce inflammation.In severe cases, systemic corticosteroids (e.g., prednisone 0.5-1 mg/kg/day) may be considered.Workup and Diagnostic ConfirmationClinical diagnosis based on characteristic lesions and history.Serologic testing for Mycoplasma pneumoniae (e.g., IgM antibodies) may be performed to confirm association.Long-Term ManagementMonitor for recurrence and manage underlying triggers, such as respiratory infections.Educate the patient on recognizing early symptoms of potential recurrences.Consider referral to a dermatologist for persistent cases or those with significant involvement.
Stevens-Johnson syndrome: Characterized by mucosal involvement and extensive skin detachment; often triggered by medications.Viral exanthems: Other viral infections can present with target-like lesions, but typically have associated systemic symptoms.Fixed drug eruption: Lesions recur at the same site upon re-exposure to the offending drug, lacking the target morphology.Psoriasis: Presents with well-defined plaques; however, lacks target morphology and is not associated with preceding infections.Urticaria multiforme: May present with similar lesions but typically lacks the characteristic target appearance.Parasitic infections: Certain cutaneous larva migrans can resemble target lesions but are associated with travel history.Acute generalized exanthematous pustulosis: Presents with pustules and systemic symptoms, distinguishing it from target lesions.Autoimmune bullous disorders: Such as pemphigus or pemphigoid, which typically present with blisters rather than target lesions.
High-Yield PearlsTarget lesions: Classic for erythema multiforme, often associated with infections, particularly Mycoplasma pneumoniae.Respiratory illness: A common trigger in pediatric patients; history of recent cough can guide diagnosis.Serologic testing: Useful in confirming Mycoplasma infection when suspected as a trigger.Systemic corticosteroids: Reserved for severe cases; topical agents are preferred for milder presentations.Monitoring: Essential for recurrence, especially in those with a history of respiratory infections.Recognizing the classic target lesions in the context of a preceding respiratory illness is crucial for timely diagnosis and management.
Tags: erythema multiforme, mycoplasma, pediatric