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The pseudoatrophic pityriasis versicolor is an atypical form of this disease with cutaneous atrophy provoked by the prolonged application of topical corticosteroids. The term "pseudoatrophic" is indicative of its reversible character.

Four cases of pityriasis versicolor in children from two to five months of age are reported and a bibliographic revision is made in this particular age group.

Clinical study and bibliographic review of the lymphomatoid papulosis (Macaulay-1968) and parapsoriasis varioliformis acute (Mucha-1916). A personal case is reported after a review of nosological location of these diseases and the variable prognosis. The authors reach the following conclusions: 1st) From the clinical point of view the small number of lesions in the lymphomatoid papulosis bring about a different clinical picture from that of parapsoriasis varioliformis acuta in here usually there is a considerable number of lesions. 2nd) There are concomitant lesions of parapsoriasis gutata in parapsoriasis varioliformis and none of the type in lymphomatoid papulosis. 3rd) Protracted course in lymphomatoid papulosis and short lived eruption in the parapsoriasis varioliformis acuta. 4th) From the histological point of view denser and atypical infiltrate in cases of parapsoriasis varioliformis.