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According to Crocker it begins in the second or third week of life, and occasionally as late as the fifth week, with diffuse and universal scaling, which may be branny or in laminae like pityriasis rubra, and either dry or with suffusion beneath the epidermis.
Greenhow has published instances of this kind under the name of "vagabond's disease," a disease simulating morbus addisonii, and particularly found in tramps and vagrants. In aged people this condition is the pityriasis nigra of Willan. According to Crocker in two cases reported by Thibierge, the oral mucous membrane was also stained.
A fatal issue is rare, but disfiguring and disabling cicatrices may be left unless great care is employed. Pigmentary Processes. Friction, pressure, or scratching, if long continued, may produce extensive and permanent pigmentation. This is seen in its highest degree in itching diseases like prurigo and pityriasis.
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