|LETTER TO EDITOR
|Year : 2019 | Volume
| Issue : 1 | Page : 86-87
Lichenoid eruption of genital region following chloroquine therapy: Uncommon presentation
Sudha Rani Chintagunta
Department of DVL, Government Medical College, Nizamabad, Telangana, India
|Date of Web Publication||14-Dec-2018|
Dr. Sudha Rani Chintagunta
Plot No. 5, Jupiter Colony, Kakaguda, Kharkhana, Secunderabad, Telangana
Source of Support: None, Conflict of Interest: None
|How to cite this article:|
Chintagunta SR. Lichenoid eruption of genital region following chloroquine therapy: Uncommon presentation. Indian J Paediatr Dermatol 2019;20:86-7
|How to cite this URL:|
Chintagunta SR. Lichenoid eruption of genital region following chloroquine therapy: Uncommon presentation. Indian J Paediatr Dermatol [serial online] 2019 [cited 2020 Jul 5];20:86-7. Available from: http://www.ijpd.in/text.asp?2019/20/1/86/247553
Lichenoid drug eruption (LDE) is a common cutaneous adverse effect with various drugs, frequently implicated are nonsteroidal anti-inflammatory, antidepressants, antihypertensives, hypoglycemic, and antimalarials. It is characterized by symmetric generalized eruption involving the trunk and extremities. A photodistributed form and oral lichenoid eruption are also not uncommon. Isolated genital involvement is rare, reported with β-blockers, mitotane, an antineoplastic medication, and Nivolumab (fully human IgG4 anti-programmed cell death) protein 1 receptor antibody., Antimalarials particularly chloroquine is reported to be the common cause of LDE. We report a case of chloroquine-induced lichenoid eruption involving the genital region only.
A 14-year-old girl presented with pigmentation of the genital region for 2-week duration. There was a history of fever followed by intake of chloroquine sulfate for 3 days. One week later, the patient noticed the pigmentation of the genital region. Cutaneous examination revealed bluish-black pigmentation on the labia, clitoris, perineum, and inguinal region with zone of hypopigmentation at the margins [Figure 1]. Oral mucosa, nails, and other areas were normal. Differential diagnosis of LDE and acanthosis nigricans was made. Biopsy from the vulva showed acanthosis, focal hypergranulosis, superficial band such as lymphohistiocytic infiltrate, and pigmentary incontinence [Figure 2] and [Figure 3]. The diagnosis of LDE was made based on the morphology, temporal association with drug intake, and histopathology.
|Figure 1: Bluish-black pigmentation of the genital region with zone of hypopigmention at the margins|
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|Figure 2: Mild hyperkeratosis, moderate acanthosis, and inflammatory infiltrate at dermoepidermal junction (×10)|
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LDEs resemble idiopathic lichen planus clinically and histologically. The average age of the onset is 44–66 years without sex predilection. The latent period ranges from few weeks to months after administration of the drug. The eruption is often pruritic and generalized with symmetrical distribution on the trunk and limbs. The cutaneous lesions are psoriasiform, eczematous, or pityriasiform and resolve with residual hyperpigmentation. Oral lichenoid lesions present as white reticular papules or erythematous erosions, often asymptomatic and unilateral. Scalp involvement is rare, reported with antimalarials and gold, genital involvement with β-blockers.
The histopathology shows focal parakeratosis, colloid bodies at dermoepidermal junction, and exocytosis of lymphoid cells to the upper epidermis. The interface infiltrate is less dense and pleomorphic with abundant plasma cells, and eosinophils with perivascular and periadnexal infiltrate.
There are no standard criteria for the diagnosis of LDE; the proposed diagnostic criteria include a history of systemic medication, clinical, and histological features of lichenoid reaction and resolution of lesions with drug discontinuation. Mild cases are managed with topical corticosteroids, and systemic corticosteroids may be required in severe cases.
Among antimalarials, chloroquine is reported to be the common cause of lichenoid eruption. Classic distribution is on the trunk, photodistribution pattern and oral lichenoid lesions are commonly described. Literature search showed few cases of chloroquine-induced hyperpigmentation of the palate with chronic use. Chloroquine-induced lichenoid eruption involving only the genital region is not mentioned in literature, this may be the first case of pigmented LDE involving the genital region only without oral or cutaneous lesions. Awareness about this rare presentation helps in the appropriate diagnosis and management.
Declaration of patient consent
The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]