There are three chronic pustular eruptions of hands and feet which are peculiarly resistant to treatment and which merit our attention as a group rather than as independent affections. They are described under the titles of acrodermatitis continua or perstans, pustular bacterid, and pustular psoriasis. They are all forms of persistent pustular pompholyx; they are perhaps only variants of one distinctive clinical entity, one particular pattern of reaction, and it would be helpful if they carried a single distinctive label.
Since these affections are four times commoner in psoriatic patients than in others, I have taken the label pustular psoriasis to cover the whole group. There are, indeed, commonly psoriatic features in the histology, but I am not suggesting that these affections are merely psoriasis.
I might have taken the label persistent pustular pompholyx for similar reasons, because there is certainly an eczematous component clinically and histologically, but
INGRAM JT. Pustular Psoriasis. AMA Arch Derm. 1958;77(3):314–318. doi:10.1001/archderm.1958.01560030060009