title: Superficial spreading (and disappearing) seborrheic keratosis.
abstract: A rapidly spreading plaque of seborrheic keratosis developed following liquid nitrogen treatment and involuted quietly after a dermatitis developed; polymerase chain reaction of the tissue did not demonstrate papillomavirus DNA. Seborrheic keratoses can both develop and involute from more than one cause.
authors.affiliation: Section of Dermatology, Mayo Clinic Scottsdale, Arizona, USA.
authors.forename: R K
authors.initials: RK
authors.lastname: Winkelmann
mesh_terms: D000368:Aged; D005260:Female; D006801:Humans; D017492:Keratosis, Seborrheic / Q000473:pathology*; D007868:Leg Dermatoses / Q000473:pathology*; D012008:Recurrence; D012867:Skin / Q000473:pathology