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case_images: Clinical aspect of PP. (A) Pruritic erythematous urticarial papules and plaques with small peripheric non-follicular pustules on the abdomen; (B,C) residual netlike hyperpigmentation following inflammatory lesions resolution, with similar erythematous papules and plaques observed on the shoulder and thigh region.
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case_images: On physical examination, erythematous-violaceous urticarial papules and plaques with small peripheral pustules were symmetrically distributed in an annular pattern across the neck, trunk, and upper thighs (Figure 1). Additionally, a reticular pattern of post-inflammatory hyperpigmentation was noted on the abdomen (Figure 1A).
case_images: Histopathological aspect of lesions. Spongiosis with exocytosis of lymphocytes and sporadic neutrophils, necrotic keratinocytes, and a mixed perivascular inflammatory infiltrate in the dermis composed of lymphocytes, eosinophils, and histiocytes.
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case_images: Histopathological analysis revealed a spongiotic epidermis with exocytosis of lymphocytes and occasional neutrophils, along with scattered necrotic keratinocytes (Figure 2).
case_images: Dramatic improvement of PP after two months of treatment.
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case_images: Within two months, the rash had completely resolved, with no subsequent recurrences and a gradual fading of the reticular pigmentation (Figure 3).