Clinical: Severe itching that may be worse at night; scaly red patches may be papular, nodular, or excoriated, and are caused by burrowing of the female mite; vesicles may be visible at the end of the burrows.
Transmission: prolonged personal contact.
Definitive diagnosis requires identification of the mite or its products.
Demonstration of the eggs containing larvae or of the egg shells (best seen on PAS) is often made.
Other findings: epidermal spongiosis (edema) and dermal eosinophils.