Bowen's disease

Bowen's disease (BD) (also known as "squamous cell carcinoma in situ") is a neoplastic skin disease; it can be considered as an early stage or intraepidermal form of squamous cell carcinoma. It was named after John T. Bowen. Erythroplasia of Queyrat is a particular type of squamous cell carcinoma in situ which can arise on the glans or prepuce in males and vulva in females, and may be induced by human papilloma virus. It is reported to occur in corneoscleral limbus.