Chronic nodular prurigo associated with nummular eczema: possible involvement of odontogenic infection.

Sir, Prurigos are diseases characterized by intensely pruritic papules and nodules caused by a variety of pathomechanisms. Primary lesions are papules, with or without vesicles, or urticarial lesions. Unlike eczematous reactions, the lesions of prurigo rarely become confluent or form lichenified plaque. Prurigo lesions do not show pustule formation or desquamation. However, prurigos can co-exist with several eczematous skin diseases, including, in particular, atopic dermatitis (1). The following is a report on cases of nodular prurigo that initially presented as nummular-like eczematous skin lesions. This type of prurigo seems distinct from classic chronic nodular prurigo Hyde, suggesting the existence of a previously undescribed subtype of nodular prurigo occurring in association with focal infection.