Hallopeau first described a conditions chiefly affecting the scalp, axillae, genitals, groins, lips and mucous membrane of the mouth which was characterized by miliary pustules, surrounded by a reddened areola, appearing in crops. These pustules coalesced and formed crusted patches beneath which might be seen vegetating surfaces more or less elevated. The increase of the patches usually occurred by the formation of new pustules at the border, rarely by peripheral extension. Other observers in this country and abroad have reported similar cases, the great majority of which developed upon an eczematous surface. This was the antecedent course of the case, illustrated in the text. The disorder often resembles pemphigus vegetans in its clinical behavior. Most authorities believe this condition is not a disease per se, but that the vegetation arises from some irritated surface such as may occur in eczema from an accidental or added infection.
Diagnosis. Dermatitis vegetans, while resembling pemphigus vegetans, yields readily to antiseptic treatment, and the general health of the patient is never affected.
Prognosis and Treatment. A pigmentation which gradually disappears is the only remnant left of this condition after a strict course of cleanliness and mild antisepsis.