A case of disseminated superficial actinic porokeratosis complicated with psoriasis vulgaris

We report a case of disseminated superficial actinic porokeratosis complicated with psoriasis vulgaris. A 57-year-old female presented with scattered rashes across her body for 50 years, and new rashes for 4 months. Dermatologic examination revealed scattered red plaques and silvery scales on the limbs with clear boundaries and Auspitz's sign. Scattered brown annular lesions with slightly elevated margins and slight depression in the center were seen on the extremities and face. Histopathology of erythematous scaly lesions on the lateral aspect of the left calf showed epidermal hyperkeratosis and parakeratosis, Munro microabscesses, thickening of the stratum spinosum, elongation of rete ridges, vasodilation, and small vessel hyperplasia with inflammatory cell infiltration in the dermis. Histopathology of brown annular lesions on the lateral aspect of the left calf showed epidermal hyperkeratosis and parakeratotic plugs. Diagnosis: disseminated superficial actinic porokeratosis complicated with psoriasis vulgaris. Oral compound glycyrrhizin tablets and topical calcipotriol ointment were administered, and the patient was lost to follow-up.