Due to their rarity, the chrotiic acquired bullous diseases of childhood have not yet beeti studied in detail. Constant changes in terminology and classification have so far achieved little apart from confusing clinicians. We have attempted, therefore, to interpret the literature, to define the diseases in question and have included some case reports of patients seen recently at St John's Hospital for Diseases of the Skin.
The pemphigus groupWhen pemphigus occurs in children, the disease is chtiically, histologically and immunologically similar to that in adults. Beutner & Chorzelski (1976) reviewed 234 cases of pemphigus and found that the disease began before the age of 10 in four cases and between 11 and 20 years in nine. Eleven of these cases were female, an incidence 5-5 times higher than in other age groups, where the sexes are equally affected. This female preponderance in children with pemphigus has been noted elsewhere (Jordon et al, 1976). It is of interest that a much larger proportion of affected children had pemphigus foliaceus or erythematosus (sis out of thirteen cases) compared with adults (twenty-seven out of 221 cases).