Zoon balanitis

plas·ma cell bal·a·ni·tis

benign circumscribed balanitis characterized microscopically by subepithelial plasma cell infiltration and clinically by small erythematous papular lesions.
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Zoon balanitis

(zoon, zon)
[Johannes Jacobus Zoon, Dutch dermatologist, b. 1902]
Infiltration of the skin of the penis by plasma cells; typically found in older men who are not circumcised. It causes a palpable, visible plaque. Synonym: balanitis circumscripta plasmacellularis; plasma cell balanitis.
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