Dermoscopy improves diagnosis of tinea nigra: a study of 50 cases

Piliouras, Peter, Allison, Scott, Rosendahl, Cliff, Buettner, Petra G. and Weedon, David (2011) Dermoscopy improves diagnosis of tinea nigra: a study of 50 cases. Australasian Journal of Dermatology, 52 3: 191-194. doi:10.1111/j.1440-0960.2011.00790.x

Author Piliouras, Peter
Allison, Scott
Rosendahl, Cliff
Buettner, Petra G.
Weedon, David
Title Dermoscopy improves diagnosis of tinea nigra: a study of 50 cases
Journal name Australasian Journal of Dermatology   Check publisher's open access policy
ISSN 0004-8380
Publication date 2011-08
Sub-type Article (original research)
DOI 10.1111/j.1440-0960.2011.00790.x
Volume 52
Issue 3
Start page 191
End page 194
Total pages 4
Place of publication Richmond, VIC, Australia
Publisher Wiley-Blackwell Publishing Asia
Collection year 2012
Language eng
Formatted abstract
Background/Objectives:  Tinea nigra is a relatively uncommon dematiaceous fungal infection of the palms and soles, which clinically may mimic a melanocytic lesion. We sought to ascertain how frequently misdiagnosis of this infection occurred and whether the use of dermoscopy helped in its diagnosis.

Methods:  Fifty consecutive cases of tinea nigra diagnosed at a dermatopathology laboratory were examined with regard to the clinical diagnosis, use of dermoscopy and the mode of management.

Results:  Of the 50 cases, 21 (42.0%) were treated by shave or surgical excision. The clinical diagnosis of tinea nigra was made in five cases (10.0%) and suggested along with other diagnoses in a further two cases (4.0%). The dermatologists (n = 9) gave the correct diagnosis in four patients (44.4%), the general practitioners (n = 38) gave the correct diagnosis in one patient (2.6%) and the three surgeons involved did not give the correct diagnosis. When dermoscopy was used, in seven of 13 (53.8%) cases tinea nigra was suggested as a probable diagnosis but when dermoscopy was not used (n = 37) tinea nigra was not clinically diagnosed (P < 0.001).

The diagnosis of tinea nigra is significantly improved by dermoscopy, the disease should be considered as a cause of palmar or plantar pigmentation.
Keyword Dematiaceous fungal infection
Palmar and plantar pigmentation
Tinea nigra
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
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