Why do some consider pustular bacterid a form of localized pustular psoriasis of the palms and soles?

The argument is based on the observation that some patients with pustular eruptions of the palms and soles also have typical psoriasis elsewhere. The clinical appearance and histologic findings of the palmar lesions are identical to those of pustular bacterid. Some dermatologists prefer the term palmar and plantar pustulosis as a noncommittal name for this entity.