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  • Title: Successful differentiation of herpes zoster-associated erythema multiforme from generalized extension of herpes by rapid polymerase chain reaction analysis.
    Author: Kasuya A, Sakabe J, Kageyama R, Ikeya S, Fujiyama T, Tokura Y.
    Journal: J Dermatol; 2014 Jun; 41(6):542-4. PubMed ID: 24909215.
    Abstract:
    The polymerase chain reaction (PCR) assay for varicella zoster virus (VZV), herpes simplex virus (HSV)-1 and HSV-2 is available for use. Sometimes the differential diagnosis of the generalized herpes zoster (HZ), HSV1/2, and drug eruption is difficult. We report a case of HZ followed by the vesicular erythema multiforme (EM)-like lesion. In this case the use of PCR was of great assistance. A 78-year-old Japanese man without any significant previous history of disease was admitted to our hospital complaining of zosteriform vesicle on an erythematous base from his right shoulder to the upper arm. We diagnosed him with HZ at the level of right Th2. In spite of the prompt start of antiviral therapy, a secondary new vesiculous erythema developed on his trunk. Clinically, it was quite difficult to differentiate the lesion from the generalized HZ. Rapid PCR assay of effusion and crust for VZV was performed. A PCR assay of VZV was positive for the crust taken from the primary lesion, while it was negative for the effusion and crust of the secondary widespread lesion. We diagnosed the secondary widespread lesion as an EM-type drug eruption induced by acyclovir, or an EM associated with herpes zoster. We then stopped the use of acyclovir and applied steroid ointment of a very strong class for the secondary lesions, which improved after a few days. A PCR assay for VZV was useful for ruling out the generalized HZ in our case with secondary developed vesiculous lesions.
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