The clinical, histopathological, and electron microscopical characteristics of "transient acantholytic dermatosis" (Grover, 1971) are described. Clinically, there are papules with smooth or keratotic surfaces and sometimes papulovesicles. The lesions are mainly distributed on the trunk predominantly of male patients past the age of 40. The disease usually disappears within weeks, but rarely may be protracted. Histologically, focal changes with the epidermis of Dariertype, Hailey-Hailey-type, pemphigus (vulgaris or foliaceus)-type, or spongiotic-acantholytic type, often in combination, are found. This disease seems to be common. Its distinctiveness should be confirmed by further observations.