Relationship of pityriasis amiantacea to psoriasis. A follow-up study

46 patients with pityriasis aminantacea have been reexamined with regard to the later development of psoriasis and atopic diseases, and their occurrence in first and second degree relatives. HLA antigens of the A, B and C series were also determined. Earlier suggestions of a close association with psoriasis were not confirmed. An association with atopic diseases could not be established. Occurrence of seborrheic dermatitis seems, however, common in patients with pityriasis amiantacea.