Abstract
Pityriasis versicolor and Malassezia intertrigo were studied mycologically and clinically. The main results were as follows: 1) Positive rates of Malassezia furfur by culture were much higher in the lesions and the normal looking skin of patients with Pityriasis versicolor than those of controls. 2) Malassezia furfur was frequently isolated from the scalp, but was not isolated from the tongue. 3) The hypopigmented lesions increased after sunburn and treatment, and in autumn and winter. 4) Positive rates of Malassezia furfur after treatment were very low by direct examination but relatively high by culture. 5) Patients who were negative by culture on completion of treatment seldom had recurrence within 2 months. 6) In the hair follicles of Pityriasis versicolor, hyphae were seen only in the orifices and acroinfundibula; however, spores of the orbiculare type were also seen in the infrainfundibula. 7) In direct examination and culture of the scales in our case of Malassezia intertrigo, large numbers of Pityrosporum ovale and a few Pityrosporum orbiculare cells were seen.
