Erythrodermic verrucous psoriasis.

Verrucous psoriasis is characterized clinically by symmetric hypertrophic verrucous plaques on an erythematous base and histologically by overlapping features of both verrucae and psoriasis with negative human papilloma virus (HPV) studies. A 46-year-old African-American male presented with an 8-year history of extensive malodorous, symmetric, verrucous plaques manifesting as erythroderma. Biopsies showed epidermal hyperplasia and papillomatosis, parakeratosis with neutrophils, and dilated vessels in the dermal papillae. The polymerase chain reaction of lesional skin was negative for HPV DNA, and T-cell gene rearrangement was negative. The patient was diagnosed with erythrodermic verrucous psoriasis. Verrucous psoriasis is a rare presentation of psoriasis and has only been reported as a localized variant. To the authors' knowledge, erythrodermic verrucous psoriasis has not been reported. This presentation was a diagnostic and therapeutic challenge and serves to heighten the awareness of a unique variant of psoriasis.