Unusual observations in the histology of Pityriasis versicolor.

Histological studies were carried out on 25 patients with various morphological types of pityriasis vesicolor. In addition to the usual features, acanthosis nigricans-like picture in papular lesions, dilated blood vessels in erythematous lesions were observed. In sections stained with Periodic acid Schiff's stain (PAS) absence of granular layer in areas of close approximation of filaments to the stratum malpighii and presence of only mycelia in the vicinity of acrosyringium were found unusual, interesting and are new findings to our knowledge.