Pityriasis rosea of Gibert: immunological aspects.

More than 200 years after first description and 150 years after complete definition by Gibert, pityriasis rosea (PR) is still a clinical entity with many obscure aspects. Although great interest was focused on aetiology, studies on immunological mechanisms associated with this disease were rather discontinuous. We present a review of the literature on immunological features of PR, aimed to outline a unified picture of currently available knowledge in this field and create a useful starting point for future research.