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Fixed drug eruption presenting as erythema dyschromicum perstans: a flare without taking any medications.
Fixed drug eruption (FDE) can present as multiple pigmented macules that flare at fixed sites even when the patient has taken no medications. Although this presentation is not characteristic of FDE, it must be borne in mind in order to make a correct diagnosis. We describe such a patient whose condition was initially diagnosed as erythema dyschromicum perstans (EDP). Immunohistochemically intraepidermal T cells were distributed between basal and suprabasal keratinocytes in the lesional skin, a finding suggestive of FDE. A flare occurred not only with exposure to theophylline but also without exposure. A flare has never recurred and pigmented macules faded gradually after avoiding theophylline. On the basis of these findings, we recommend that patients with an EDP-like presentation be examined completely for causes such as drugs before labeling the cutaneous lesions.
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