Upon what parts are burrows most commonly to be found?
In the interdigital spaces, on the flexor surface of the wrists, about the mammæ in the female, and on the shaft of the penis in the male.
Are burrows usually present in numbers?
No. Several may be found in a single case, but they are rarely numerous, as the irritation caused by the penetration of the parasites leads either to violent scratching and their destruction, or gives rise to the formation of vesicles and pustules, and consequently their formation is prevented.
What course does scabies pursue?
Chronic and progressive, showing no tendency to spontaneous disappearance.
To what is scabies due?
To the invasion of the cutaneous structures by an animal parasite, the sarcoptes scabiei (acarus scabiei). The male mite is never found in the skin and apparently takes no direct part in the production of the symptoms.
Fig. 77. FIG. 78.
