Shall we exclude parapsoriasis from the medical vocabulary?

Since the first description of parapsoriasis more than 100 years ago, parapsoriasis has been a questionable condition and occasionally considered a precursor of cutaneous lymphoma. The name "parapsoriasis" is related to a heterogenous group of diseases that show a distinct clinical presentation; however, the histopathological criteria are not strongly specific. Pathologists do not consider parapsoriasis as a possible histopathological diagnosis, but dermatologists use the term as clinical hypothesis. We aim to provide an historical review of parapsoriasis focusing on histopathological criteria, considering its possible relation with cutaneous skin lymphoma, based on articles from PubMed and standard dermatopathological books. Parapsoriasis does not have well-defined histopathological criteria, so its use should be avoided. Being aware of parapsoriasis complexity, a consensus meeting can help to create a guideline regarding this topic.

[To the problem of parapsoriasis: classification problems (literature review and personal observations)].

In the presented article we discuss the problems of lichenoid and plaque parapsoriasis. The difference in Russian and English classifications are discussed in the historical aspect, as well as review of the literature, and personal authors' observations of nine patients with "small plaque parapsoriasis".

History of psoriasis and parapsoriasis.

Parapsoriasis is not a disease entity. It is an auxiliary term introduced in 1902 to group several dermatoses with a faint similarity to psoriasis. The historical development leading to the creation of the term parapsoriasis is outlined and the history of psoriasis is briefly reviewed.