“…Transient acantholytic dermatosis was first intensely pruritie papular eruptions on his reported by Grover (1970), This disease is scalp, faee, neck, trunk, arms, and forearms somewhat similar to pemphigus, Darier disease, benign chronic familial pemphigus (Hailey-Hailey disease) and benign papular acantholytie dermatosis because of the presence of suprabasilar aeantholysis in histopathology, Histologically, this disease may be classified into four patterns; pemphigus vulgaris-like, Darier-like, Hailey-Hailey-like, or spongiotie acantholytic patterns, sinjjly or in combination (Chalet et al, 1977). Electron microscopic studies of dyskeratotic varieties of this disease have been reported (Grover 1971, Grover & Duffy 1975 but not of a pemphigus vulgarislike one. All of the cases reported showed cutaneous involvement, exeept one which showed an involvement of nostril (Waisman et al, 1976), We report an electron microscopic study of a case of transient acantholytie dermatosis with oral mueosal involvement (pemphigus vulgaris-like pattern).…”