All are true statements regarding us, EXCEPT:
It is a form of Tinea capitis
It is caused by Tinea schoenlein
It causes cicatricial alopecia
It is characterised by presence of dark brown to black nodules cemented to the hair shaft
It is characterised by yellowish cup shaped crests called scutula. Dark brown/black nodules are seen as black piedra caused by piedraia hoae.Ref: Rook's Textbook of Dermatology, 8th Edition