It is of two types:

I. Dry variety (Pityriasis sicca):

  • Usually affects people with dry skin and scalp (especially those people who do not use oil at all or rarely)
  • More common in winter than in summer.
  • Has a favorable response to treatment
  • It is characterized by:
    • dry scales which freely fall on the shoulders
    • fine, thin scales which are white or grayish in color
    • mild to moderate itching
    • dry and lustreless hair

II. Greasy variety (Pityriasis steatoides):

  • Usually affects people with oily skin and scalp.
  • Usually responds poorly to treatment
  • It is characterized by:
    • dandruff patches which may be localized or present through out the scalp. In severe cases the eyebrows, eyelids, beard, armpit, groins may also be affected.
    • waxy or greasy scalesĀ 
    • thick scales or crusts which are yellowish in color
    • moderate itching
    • matted hair