The journal of dermatology vol.32 no.12
The Journal of DermatologyVol. 32: 972–975, 2005
A Case of Lichenoid Drug Eruption Associated
Emiliano Antiga, Lucilla Melani, Carla Cardinali, Barbara Giomi,
Marzia Caproni, Stefano Francalanci And Paolo Fabbri
A 53-year-old man developed lichenoid lesions on the upper chest, posterior surfaces of
the trunk, and abdominal region about three months before his first visit. Physical exami-nation and laboratory findings were normal; histopathology showed vacuolar degenera-tion of basal keratinocytes in association with a dense lympho-histioid infiltrate arrangedin a lichenoid pattern with a few melanophages and eosinophils. The fact that our patienthad been irregularly taking sildenafil citratus (Viagra®) led to the hypothesis of alichenoid drug-induced eruption. Our hypothesis was confirmed by clinical resolutionthree weeks after discontinuation of sildenafil citratus; moreover, the patient avoided thedrug for about four months, and the eruption didn’t reappear. Subsequently, we per-formed a challenge test with the drug, and the patient developed similar lichenoid lesions.
Lichenoid eruptions are rather common dermatoses that can be induced by a great num-ber of environmental agents and are clinically but not pathogenetically well defined. Wereport the present case because, despite the great number of drugs that can be implicatedin the development of lichenoid eruptions, the association of such dermatoses and silde-nafil citratus had been described only once previously in the literature until now. Furthe-more, we wish to remark on the significance of a detailed anamnestic history to make thecorrect differential diagnosis between lichenoid drug-induced eruptions and lichenplanus. This has a great clinical importance because simple discontinuation or substitu-tion of the drug causes lichenoid drug-induced eruption resolution.
lichenoid drug-induced eruption; sildenafil citratus
and morphologically very similar, but not
identical, to LP. The etiology of this noso-
graphic entity has been associated with a va-
entity consisting of an eruption of viola-
ceous, scaling, angular papules characteris-tically found on the flexor surfaces, mucous
membranes, and genitalia, either as isolated
We report the case of a 53-year-old man who
lesions or in aggregate patterns; ungueal or
was first referred to our Dermatological Unit in
hair involvement is quite common (1). The
February of 2003, complaining of lichenoid le-
term “lichenoid eruption” is used to indi-
sions that had developed about three months
cate a cutaneous reaction that is clinically
previously on the upper chest, posterior surfacesof the trunk, and abdominal region (Fig. 1).
Received September 21, 2004; accepted for publi-
The lesions consisted of erythematous and in-
filtrated papules ranging from one half to two
II Department of Dermatological Sciences, Univer-
centimeters in diameter. Some of them had a
polycyclic-annular appearance with the central
Reprint requests to: Marzia Caproni, II Depart-
area more reddish and infiltrated, while the
ment of Dermatological Sciences, Via degli Alfani 37,50121, Florence, Italy.
outer erythematous ring was not well-defined.
Fig. 1. Lichenoid lesions of the chest (A), of the dorsal surface (B) and
the lateral surface of the trunk (C), with a detail of the lesions (D)
The patient did not complain of pruritus orother associated symptoms. In addition, uponexamination, he didn’t show any oral, ungueal,or scalp involvement. The patient had neverbeen affected previously by similar cutaneous le-sions. Blood examination showed no any alter-ations, and his eosinophil count was normal.
Moreover, HBV and HCV serological markerswere negative.
Histological examination of the lesional skin of
the chest documented acanthosis of the epider-mis, with vacuolar degeneration of basal ker-atinocytes and focal parakeratosis, in associationwith a dense lympho-histioid infiltrate disposed ina lichenoid pattern. A few melanophages andeosinophils were detectable in the dermis (Fig. 2).
with the diagnosis of lichen planus, the consider-
▲ Fig. 2. Acanthosis and vacuolar degeneration of
basal keratinocytes, in association with a denselympho-histioid infiltrate disposed in a lichenoidpattern. In the box, detail of eosinophils withinthe dermal infiltrate.
pothesis of lichenoid drug-induced eruption was
confirmed by clinical resolution three weeksafter discontinuation of sildenafil citratus; more-
over the patient avoided the drug for about four
months and the eruption did not reappear. Sub-
sequently, we performed a challenge test with
the drug, and the patient developed similar
lichenoid lesions nine days later. The new erup-
tion disappeared in about three weeks. After the
challenge test, we proposed patch tests, but the
ation that our patient had been irregularly tak-
dermatoses that can be induced by a great
ing sildenafil citratus (Viagra®) led to the hypoth-
esis of a possible lichenoid drug-induced erup-
clinically but not pathogenetically well de-
tion. The drug had been started about two or
fined, unlike LP, which is characterized by a
three months before the first clinical manifesta-
persistent activation of CD8+ autocytotoxic
tions and was taken for the last time four days be-
T-lymphocytes against epidermal cells (2).
fore our clinical examination. The patient did
In previous literature, it has been asserted
not mention to variations in his clinical course
that drugs can play a pathogenetic role in
during the three months before our observation;
the development of such lesions; they prob-
he had used the drug about once or twice a week,
and his cutaneous manifestations were stable,
munogenetic antigens by linking to epider-
without exacerbation, when the drug was taken.
Moreover, it seems worth remarking that the
patient had not initiated any other drug in the
eruptions is already long and continues to in-
last six-month period, and there were no indica-
crease steadily. It often occurs with demeclo-
tions of cardio-vascular or dismetabolic disor-
cycline (3), quinine (4), acetylsalicylic acid
ders in the clinical history. Our diagnostic hy-
(5), thiazide diuretics, streptomycin, isoni-
Differences among lichen planus and lichenoid eruptions
azide, levopromazine, amiphenazole, methyl-
mittently instead of continuously, as in most
dopa, and pyrimetamine. Relatively more re-
cent additions include reactions to β-block-
ing agents, enalapril (6), captopril, carba-
significance of a detailed anamnestic history
mazepine, ethambutol, pravastatin (7), sim-
to make the correct differential diagnosis
vastatin, and many others (Table 1) (8, 9).
and lichen planus, and to correctly identify
severe, and resolution can be slow (about
the etiological agent. This has great impor-
2–3 months) after withdrawal of the impli-
tance not only epidemiologically, but overall
clinically, because simple discontinuation or
substitution of the drug induces resolution.
lichenoid eruptions don’t often involve thedor hands’ dorsal region, the genitals and
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helpful, because of the presence of focal
parakeratosis (10), of eosinophils within the
2) Sughman PB, Satterwhite K, Biagy H: Autocyto-
dermal infiltrate, and the frequent absence
toxic T-cells clones in lichen planus, Br J Derma-
of epidermal hypergranulosis, which is a very
: 449–456, 2000.
3) Epstein J, Maibach HI, Sams M: Photosensitive
these histopathological features can be con-
lichenoid eruption associated with demeclocy-
cline, Arch Dermatol
: 97–98, 1974.
sidered as a significant criterium allowing a
4) Meyrick Thomas RH, Munro DD: Lichen Planus
in photosensitive distribution due to quinine,
Clin Exp Dermatol
: 97–101, 1986.
nevertheless, their observation can give a
5) Ruiz VR, Blasco MJ, Mendoza GF, Martin S MC,
Naranjo SR: Generalized lichen planus-likeeruption due to acetylsalicylic acid, J Eur Acad
In our patient, suspicion of a LP-like erup-
: 470–472, 2003.
tion arose from the clinical distribution and
6) Ruiz VR, Blasco MJ, Linares SJ, Serrano OS:
histological signs (parakeratosis, eosinophils;
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absence of hypergranulosis) of the lesions,
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: 612–614, 2003.
and above all from the anamnestic detection
7) Keough GC, Richardson TT, Grabski WJ: Pravas-
of sildenafil citratus intake and the positivity
tatin-induced lichenoid drug eruption, Cutis
8) Black MM: Lichen planus and lichenoid disor-
Sildenafil citratus is a phosphodiesterase
ders, in Rook A, Wilkinson DS, Ebling FJC (eds):
type 5 inhibitor indicated for erectile dys-
Textbook of Dermatology
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function. It enhances the effect of nitrous
oxide on penile erection by preventing the
9) Braun-Falco O, Plewig G, Wolff HH, Burgdorf
, Springer-Verlag, Berlin, Hei-
a cyclic nucleotide which produces smooth
10) Van den Haute V, Antoine JL, Lachapelle JM:
Histopathological discriminant criteria between
lichenoid drug eruption and idiopathic lichen
spite the great number of drugs that can be
planus: Retrospective study on selected samples,
implicated in the development of lichenoid
: 10–13, 1989.
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netti A (ed): Trattato di Dermatologia
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scribed only once previously in the litera-
12) Fabbri P: Lichen planus, in Fabbri P (ed): Im-
ture until now (13). Interestingly, like the
, ISED, Brescia, 2002, p 220.
one previously described, our case is unusu-
13) Goldman BD: Lichenoid drug reaction due to
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al because the medication was taken inter-
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