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J Cutan Med Surg. 2018 Jan/Feb;22(1):94-96. doi: 10.1177/1203475417724439. Epub 2017 Aug 17.

Case Report of Onychomycosis and Tinea Corporis Due to Microsporum gypseum.

Author information

1
1 Paul L. Foster School of Medicine, Texas Tech University Health Sciences Center, El Paso, TX, USA.
2
2 Department of Dermatology, Texas Tech University Health Sciences Center, Lubbock, TX, USA.
3
3 Texas Tech University Health Sciences Center, Lubbock, TX, USA.

Abstract

BACKGROUND:

Microsporum gypseum is a geophilic dermatophyte that colonises keratinous substances in the soil. Fur-bearing animals carry this dermatophyte but are rarely infected. Human infection can be acquired from the soil, carrier or infected animals, and rarely other humans. M gypseum is an uncommon cause of cutaneous infection in humans and typically manifests as tinea corporis, tinea barbae, and tinea capitis. Onychomycosis is rarely caused by M gypseum.

CASE SUMMARY:

We present a case of a 32-year-old white man who presented with a red scaly rash and nail dystrophy after adopting a pet rat 10 years prior to presentation. A fungal culture of a nail clipping grew out M gypseum, and the patient was treated with terbinafine daily for 6 weeks for dystrophic onychomycosis and tinea corporis. After the 6 weeks of treatment, the erythema at the proximal nail fold and distal finger had improved but still persisted. An additional 6 weeks of terbinafine daily completely resolved the clinical manifestations of onychomycosis.

CONCLUSION:

The increase in incidence of M gypseum onychomycosis over the past 2 decades is thought to be due to phylogenetic evolution of the dermatophyte from soil saprophyte to a human parasite. Increasing domestication of mammals is also thought to contribute to increasing incidence. Treatment consists of an extended course of terbinafine or itraconazole.

KEYWORDS:

Microsporum gypseum; onychomycosis; tinea corporis

PMID:
28817957
DOI:
10.1177/1203475417724439
[Indexed for MEDLINE]

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