. rose a

Syn.: p. maculata et circinata. A disease of the skin characterized by the development of symmetrically distributed macules or patches which are rounded or circinate in outline, slightly scaly, and of a faint red color, p. rubra (Hebra). This is a form of persistent general exfoliative dermatitis, first described by Hebra under the name p. rubra, p. rubra pilar is. A chronic disease characterized by the formation around the hair follicles of subacute inflammatory papules, which are capped by acuminate horny scales. These coalesce and produce infiltrated plaques of dry, scaling dermatitis involving large areas, p. versicolor. Another name for tinea versicolor. [Gr., pityron, bran.]