Jessner lymphocytic infiltrate of the skin (also known as "Benign lymphocytic infiltration of the skin," "Jessner lymphocytic infiltration of the skin," "Jessner–Kanof lymphocytic infiltration of the skin," and "Lymphocytic infiltrate of Jessner") is a cutaneous condition characterized by a persistent papular

Papule

A papule is a circumscribed, solid elevation of skin with no visible fluid, varying in size from a pinhead to 1 cm.With regard to the quote "...varying in size from a pinhead to 1cm," depending on which text is referenced, some authors state the cutoff between a papule and a plaque as 0.5cm,...

 and plaque-like skin eruption.
Thought to occur on the neck, face and back and may re-occur. This is a uncommon skin disease and is a benign collection of lymph cells. The cause of this is not known and can be hereditary.
It is named for Max Jessner.

It has been suggested that it is equivalent to lupus erythematosus tumidus.