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Chungnam National University, South Korea
Posters & Accepted Abstracts: J Clin Exp Dermatol Res
Suddenly occurring acquired hyperpigmentation on sun exposed area is often misdiagnosed as hyperpigmentary disorders due to chronic sun exposure. Lichenoid photodermatitis, a photoallergic reaction with characteristic histology showing lichenoid dermatitis, clinically appears as pigmentary dermatitis. Previous reports have noted a variety of drugs and contact allergens as causable factors. Two female patients presented with erythematous to hyperpigmented scaly patch with itchy and pricking sense on face and neck, since few weeks ago. Histopathological examinations showed vacuolar interface dermatitis with lichenoid lymphocytic infiltration. Based on clinical and histological findings, the patients were diagnosed as lichenoid photodermatitis. Personal care products or hair dyes, as suspected contributing factors, were ceased and aggravating erythema showed improvement leaving only hyperpigmentation. In the case of acquired hyperpigmentation with photodistribution, it is necessary to consider lichenoid photodermatitis.