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Case Reports
. 2025 Oct 10:66:230-233.
doi: 10.1016/j.jdcr.2025.09.035. eCollection 2025 Dec.

Citrobacter koseri infection of the nose masquerading as keratoacanthoma: A case report and review of the literature

Grace Sora Ahn  1 , Allison M Han  1 , Zhe Jessie Hou  1 , Brian Hinds  1 , Shang I Brian Jiang  1
Affiliations
Case Reports

Citrobacter koseri infection of the nose masquerading as keratoacanthoma: A case report and review of the literature

Grace Sora Ahn et al. JAAD Case Rep. .
No abstract available

Keywords: Citrobacter koseri; SSTI; iatrogenic infection; keratoacanthoma; pseudocarcinomatous hyperplasia.

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Conflict of interest statement

None disclosed.

Figures

Fig 1
Fig 1
Initial onset with acneiform papule of the right nasal sidewall (A); erythematous scaly plaque after 2 months at presentation (B); mildly atrophic residual scars postantibiotic treatment (C); lack of recurrence after 3 years (D).
Fig 2
Fig 2
Keratoacanthoma-like endophytic metaplastic proliferation of the right nasal sidewall (A). Close-up of interconnecting cyst-like spaces in background of syringosquamous metaplasia and numerous neutrophilic microabscesses along adnexal structures (B). PAS-D (top right), Gram (middle right), AFB (bottom right) stains were all negative (C).
Fig 3
Fig 3
Systematic PubMed/MEDLINE literature review of Citrobacter skin and soft tissue infection case reports.
See this image and copyright information in PMC

References

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