Pemphigus is a term applied to a collection of bullous eruptions of uncertain etiology, after exclusion of the bullous phases of such eruptions as streptococcic impetigo, erythema multiforme and lichen planus, potassium iodide dermatitis, etc. The only thing to be said is that, apart from the severity of the attack calling for special diet, it will be advisable to carefully investigate for any source of toxic poisoning in the intestinal tract.