In this form the bullae, well distended by fluid, persist unchanged for several days, at the end of which time they rupture, and discharge a thin, not very plastic fluid, differing greatly in this respect from the plastic exudation of eczema. Sometimes the stratum corneum reapplies itself to the skin, and remains in contact until the surface beneath is entirely healed and covered with a new epidermis. It is then shed, and reveals a circumscribed reddened surface, which soon, however, regains its normal color. At other times the covering of the bullae is detached soon after rupture, and displays a red and oozing surface. This becomes drier as the new-formed, horny layer replaces the old, when the heightened color gradually fades away. After the disappearance of the bullae, which marked the invasion of the disease, or even before they are completely gone, fresh ones may arise, or, on the other hand, several weeks may elapse before a recurrence takes place. These relapses may prolong the disease for an indefinite period. Finally, either spontaneously or as the result of treatment, no new bullae appear, and the patient is well. This favorable termination, however, does not always occur; but the affection persisting for several years, the patient is carried off by some intercurrent disease.