Squamous cell carcinoma in situ
Erythroplasia of Queyrat refers specifically to SCCis of the glans penis and prepuce, most commonly seen in uncircumcised individuals. It is typically a red, moist, smooth or eroded plaque.
Bowenoid papulosis refers to a high-risk HPV infection (ie, HPV strains 16 and 18) with histologic features of SCCis, usually in the genital or perianal area. Periungual SCCis is also linked to high-risk HPV infection.
Arsenic-induced SCCis can be multifocal and most commonly affects acral surfaces (see arsenical keratosis).
Related topic: Cutaneous squamous cell carcinoma
D04.9 – Carcinoma in situ of skin, unspecified
189565007 – Squamous cell carcinoma in situ
Differential Diagnosis & Pitfalls