DR P MARAZZI / SCIENCE PHOTO LIBRARY Carcinoma in situ Carcinoma in situ can include Erythroplasia of Queyrat Bowen disease of the penis Paget disease of the nipple Bowenoid papulosis Erythroplasia of Queyrat and Bowen disease of the penis are well-circumscribed areas of reddish, velvety pigmentation in the genital area, usually on the glans or at the corona, primarily in uncircumcised men.