Retronychia is a frequently misdiagnosed nail disorder characterized by proximal ingrowth of the nail into the proximal nail plate. Often presenting with chronic paronychia, retronychia is commonly misdiagnosed and treated ineffectively with antimicrobials. The main cause is repeated micro-trauma to the affected nail, therefore a thorough history of exposures and insults to the toenail is crucial in identifying the cause of this nail abnormality. Herein, we describe a case of a UPS employee who presented with a painful nail after dropping a package on her foot that was unresponsive to medical treatment for 2 years. This case highlights the importance of taking a thorough history and physical examination for diagnosing retronychia.

Keywords:
Retronychia, Occupational retronychia, Occupational nail disorders, Nail disorder
1.
Gerard
 
E
,
Prevezas
 
C
,
Doutre
 
MS
,
Beylot-Barry
 
M
,
Cogrel
 
O
.
Risk factors, clinical variants and therapeutic outcome of retronychia: a retrospective study of 18 patients
.
Eur J Dermatol
.
2016
 
Aug
;
26
(
4
):
377
–
81
.
[PubMed]
1952-4013
Google Scholar
PubMed
 
2.
Ventura
 
F
,
Correia
 
O
,
Duarte
 
AF
,
Barros
 
AM
,
Haneke
 
E
.
“Retronychia—clinical and pathophysiological aspects”
.
J Eur Acad Dermatol Venereol
.
2016
 
Jan
;
30
(
1
):
16
–
9
.
https://doi.org/10.1111/jdv.13342
[PubMed]
0926-9959
Google Scholar
Crossref
Search ADS
PubMed
 
3.
Baumgartner
 
M
,
Haneke
 
E.
 
Retronychia: diagnosis and treatment.
Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al].
2010
;36(10):1610-1614.
https://doi.org/10.1111/j.1524-4725.2010.01693.x
Google Scholar
 
4.
de Berker
 
DA
,
Richert
 
B
,
Duhard
 
E
,
Piraccini
 
BM
,
André
 
J
,
Baran
 
R
.
Retronychia: proximal ingrowing of the nail plate
.
J Am Acad Dermatol
.
2008
 
Jun
;
58
(
6
):
978
–
83
.
https://doi.org/10.1016/j.jaad.2008.01.013
[PubMed]
0190-9622
Google Scholar
Crossref
Search ADS
PubMed
 
5.
Tosti
 
A
,
Pazzaglia
 
M
. Occupational nail disorders. In:
Scher
 
RK
,
Daniel
 
CR
, editors.
Nails
. 3rd ed. 
Philadelphia, USA
:
Elsevier
;
2005
. pp.
205
–
14
.
https://doi.org/10.1016/B978-141602356-2.50024-4
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