Case
Published · Updated · 2 min read
Eruption during terbinafine treatment: dermatophytid rather than a drug reaction
What it means for practice
An eruption after starting antifungal treatment is not always a drug reaction. In this case, dermatology consultation helped identify dermatophytid and continue treatment.
Summary
The case concerns a 10-year-old boy weighing 27 kg with no significant medical history, who initially presented with a crusted occipital lesion measuring approximately 3 cm along its longest axis. Staphylococcal pseudotinea was initially suspected. The child was subsequently treated for tinea capitis.
According to the abstract attached to the link, a diffuse erythematous papular eruption developed after terbinafine was started. It was ultimately identified as dermatophytid—an immune response to fungal antigens, rather than a drug reaction. Teledermatology consultation helped establish the diagnosis and continue antifungal treatment.
The practical focus of the case is the need to distinguish dermatophytid from a drug reaction: stopping antifungal therapy because of a misinterpreted eruption could hinder infection resolution. The case also illustrates the role of expert consultation in a challenging diagnostic situation.
The accessible publication excerpt does not provide the complete clinical course, terbinafine dose, precise timing of the eruption, or a formal causality assessment. The conclusion regarding dermatophytid and continued treatment comes from the attached abstract.
Case analysis
- Likely mechanism
- According to the attached abstract, the eruption was dermatophytid—an immune response to fungal antigens rather than a reaction to terbinafine.
- Causality assessment
- The available materials provide no author-reported Naranjo or WHO-UMC assessment. Editorial WHO-UMC assessment of the relationship between the eruption and terbinafine: conditional/unclassified, because the complete clinical course and timing are needed for assessment. The attached abstract identifies dermatophytid as an alternative explanation.
- Take-home lesson
- The occurrence of an eruption after starting terbinafine does not itself establish a drug reaction. In this case, recognition of dermatophytid through teledermatology allowed antifungal treatment to continue.
Source
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Une éruption lors du traitement d’une teigne : faut-il arrêter l’antifongique ?. Pédiatrie Pratique.
Reviewed by: DrugCard editorial team ·
This article does not replace clinical judgement. Disclaimer
