. The ready-reference handbook of diseases of the skin. o bullae, the covers of which may fall and a super-ficial ulceration be left. The duration of the disease is abouteight or ten days. The most common location is upon theupper lip, but it may be anywhere upon the face, aod notuncommonly the groups develop bilaterally. The mucousmembrane of the mouth may also be involved, but here,owing to the heat and moisture, the vesicles are seldom seen,as they break down and leave excoriated points. There isa strong tendency for the disease to recur with the recur-rence of the exciting cause. In some c


. The ready-reference handbook of diseases of the skin. o bullae, the covers of which may fall and a super-ficial ulceration be left. The duration of the disease is abouteight or ten days. The most common location is upon theupper lip, but it may be anywhere upon the face, aod notuncommonly the groups develop bilaterally. The mucousmembrane of the mouth may also be involved, but here,owing to the heat and moisture, the vesicles are seldom seen,as they break down and leave excoriated points. There isa strong tendency for the disease to recur with the recur-rence of the exciting cause. In some cases it recurs at ir-regular intervals for months and without apparent cause. 264 DISEASES OF THE SKIN. Etiology. It is still an undetermined question whetherherpes facialis is a zoster or not. By most authorities it isconsidered to be an independent disease; by a few it isthought to be an incomplete zoster. It is known to occurwith catarrhal inflammations of mucous membranes, such asa coryza or bronchitis; with digestive derangement, as gas- FlG. J* il <in ^flfewi^f


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Keywords: ., bo, bookcentury1800, bookdecade1890, booksubjectskin, bookyear1896