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1</a>A&#8211;C&#41;&#46; The oral and genital mucosa and nails were normal&#46; The patient reported that she had been diagnosed with PCR-confirmed COVID-19 just 10 days before the lesions had appeared&#46; She had not been hospitalized for COVID-19&#44; but did receive treatment with favipiravir and analgesics&#46; The information provided was confirmed by consulting the local COVID-19 database&#46; The infection subsided within 5 days&#44; and the skin lesions began to appear shortly afterwards&#46; The patient did not consult a doctor&#44; as she hoped that the lesions would disappear on their own&#46; The relationship between COVID-19 and the skin lesions was not therefore recorded at the time&#44; which is a weakness of this report&#46; The differential diagnosis included lichen planus&#44; lichenoid drug eruption&#44; PLC&#44; atypical pityriasis rosea&#44; and prurigo&#46; Histopathologic examination showed hyperkeratosis&#44; irregular acanthosis&#44; focal spongiosis&#44; lymphocyte exocytosis in the epidermis&#44; and a band-like lymphocytic infiltrate and melanophages in the superficial dermis &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46; Based on the clinical and histologic findings&#44; the patient was diagnosed with PLC and treated with oral doxycycline&#44; topical corticosteroids&#44; and emollients&#46; The lesions did not improve after 1 month of doxycycline&#44; and the patient was started on narrowband UV-B therapy&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0015" class="elsevierStylePara elsevierViewall">Three pathogenic mechanisms have been proposed for PL in the literature&#58; an inflammatory reaction triggered by infectious agents&#44; an inflammatory response secondary to T-cell dyscrasia&#44; and immune complex&#8211;mediated hypersensitivity vasculitis&#46; PL has been described in association with several infectious agents&#44; namely&#44; <span class="elsevierStyleItalic">Toxoplasma gondii&#44;</span> Epstein-Barr virus&#44; HIV&#44; cytomegalovirus&#44; parvovirus B19&#44; staphylococci&#44; and &#946;-hemolytic streptococci&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">4</span></a> An association with vaccines has also been speculated&#46; Filippi et al&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">5</span></a> recently described a case of PL triggered by the measles-mumps-rubella vaccine&#46; Cutaneous manifestations associated with COVID-19 have been divided into 6 clinical patterns&#58; an urticarial rash&#44; a morbilliform rash&#44; papulovesicular exanthem&#44; a chilblain-like acral pattern&#44; a livedo reticularis-like pattern&#44; and a purpuric-vasculitic pattern&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">2</span></a> Other skin manifestations&#44; such as petechiae&#44; cutaneous mottling&#44; eruptive cherry angioma&#44; violaceous macules with porcelain-appearance&#44; non-necrotic or necrotic purpura&#44; aphthous ulcers&#44; purpuric exanthema&#44; telogen effluvium&#44; and relapsing livedo reticularis are also defined as less commonly seen dermatological findings of COVID-19&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">6</span></a> To our knowledge&#44; PLC has not yet been reported in association with COVID-19&#46; Oral antibiotics &#40;tetracycline&#44; erythromycin&#41;&#44; topical corticosteroids&#44; and calcineurin inhibitors are recommended as the initial treatment for PLC&#46; Narrowband UV-B&#47;psoralen plus UV-A phototherapy may be considered as a second-line treatment for more resistant disease&#44; followed by methotrexate&#44; acitretin&#44; dapsone&#44; cyclosporine&#44; or a combination of these&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">4</span></a></p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of Interest</span><p id="par0020" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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Case and Research Letter
A Case of Pityriasis Lichenoides Chronica in a Patient With COVID-19 Infection
Un caso de pitiriasis liquenoide crónica en una paciente infectada por COVID-19
I.N. Durusua,
Autor para correspondencia
iremnurdurusu@gmail.com

Corresponding author.
, G. Gurela, C. Tokyolb
a Department of Dermatology, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey
b Department of Pathology, Afyonkarahisar Health Sciences University, Afyonkarahisar, Turkey
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Pityriasis lichenoides chronica &#40;PLC&#41; is a rare skin disease characterized by slowly progressive red-to-brown erythematous papules with central scaling&#46; Although some cases have been reported in conjunction with viral illnesses&#44; the etiology of PLC is uncertain&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">1</span></a> COVID-19 is an ongoing global pandemic caused by SARS-CoV-2&#46;<a class="elsevierStyleCrossRefs" href="#bib0040"><span class="elsevierStyleSup">2&#44;3</span></a> We present a case of PLC that developed shortly after COVID-19 confirmed by polymerase chain reaction &#40;PCR&#41;&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">A 42-year-old woman presented with pruritic lesions that had appeared over the course of 5 months&#46; Skin examination showed extensive areas of erythematous-purple lichenoid papules and plaques on the trunk and extremities &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>A&#8211;C&#41;&#46; The oral and genital mucosa and nails were normal&#46; The patient reported that she had been diagnosed with PCR-confirmed COVID-19 just 10 days before the lesions had appeared&#46; She had not been hospitalized for COVID-19&#44; but did receive treatment with favipiravir and analgesics&#46; The information provided was confirmed by consulting the local COVID-19 database&#46; The infection subsided within 5 days&#44; and the skin lesions began to appear shortly afterwards&#46; The patient did not consult a doctor&#44; as she hoped that the lesions would disappear on their own&#46; The relationship between COVID-19 and the skin lesions was not therefore recorded at the time&#44; which is a weakness of this report&#46; The differential diagnosis included lichen planus&#44; lichenoid drug eruption&#44; PLC&#44; atypical pityriasis rosea&#44; and prurigo&#46; Histopathologic examination showed hyperkeratosis&#44; irregular acanthosis&#44; focal spongiosis&#44; lymphocyte exocytosis in the epidermis&#44; and a band-like lymphocytic infiltrate and melanophages in the superficial dermis &#40;<a class="elsevierStyleCrossRef" href="#fig0010">Fig&#46; 2</a>&#41;&#46; Based on the clinical and histologic findings&#44; the patient was diagnosed with PLC and treated with oral doxycycline&#44; topical corticosteroids&#44; and emollients&#46; The lesions did not improve after 1 month of doxycycline&#44; and the patient was started on narrowband UV-B therapy&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia><elsevierMultimedia ident="fig0010"></elsevierMultimedia><p id="par0015" class="elsevierStylePara elsevierViewall">Three pathogenic mechanisms have been proposed for PL in the literature&#58; an inflammatory reaction triggered by infectious agents&#44; an inflammatory response secondary to T-cell dyscrasia&#44; and immune complex&#8211;mediated hypersensitivity vasculitis&#46; PL has been described in association with several infectious agents&#44; namely&#44; <span class="elsevierStyleItalic">Toxoplasma gondii&#44;</span> Epstein-Barr virus&#44; HIV&#44; cytomegalovirus&#44; parvovirus B19&#44; staphylococci&#44; and &#946;-hemolytic streptococci&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">4</span></a> An association with vaccines has also been speculated&#46; Filippi et al&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">5</span></a> recently described a case of PL triggered by the measles-mumps-rubella vaccine&#46; Cutaneous manifestations associated with COVID-19 have been divided into 6 clinical patterns&#58; an urticarial rash&#44; a morbilliform rash&#44; papulovesicular exanthem&#44; a chilblain-like acral pattern&#44; a livedo reticularis-like pattern&#44; and a purpuric-vasculitic pattern&#46;<a class="elsevierStyleCrossRef" href="#bib0040"><span class="elsevierStyleSup">2</span></a> Other skin manifestations&#44; such as petechiae&#44; cutaneous mottling&#44; eruptive cherry angioma&#44; violaceous macules with porcelain-appearance&#44; non-necrotic or necrotic purpura&#44; aphthous ulcers&#44; purpuric exanthema&#44; telogen effluvium&#44; and relapsing livedo reticularis are also defined as less commonly seen dermatological findings of COVID-19&#46;<a class="elsevierStyleCrossRef" href="#bib0060"><span class="elsevierStyleSup">6</span></a> To our knowledge&#44; PLC has not yet been reported in association with COVID-19&#46; Oral antibiotics &#40;tetracycline&#44; erythromycin&#41;&#44; topical corticosteroids&#44; and calcineurin inhibitors are recommended as the initial treatment for PLC&#46; Narrowband UV-B&#47;psoralen plus UV-A phototherapy may be considered as a second-line treatment for more resistant disease&#44; followed by methotrexate&#44; acitretin&#44; dapsone&#44; cyclosporine&#44; or a combination of these&#46;<a class="elsevierStyleCrossRef" href="#bib0050"><span class="elsevierStyleSup">4</span></a></p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of Interest</span><p id="par0020" class="elsevierStylePara elsevierViewall">The authors declare that they have no conflicts of interest&#46;</p></span></span>"
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