Bowen's disease (Squamous cell carcinoma in situ) is not a serious condition. It is due to the growth of cancerous cells confined to the surface layers of the skin. It is due to sun exposure and is common in sun-exposed areas of the face, scalp, neck and lower legs.
Bowen's disease looks like a defined area of scaly skin and can resemble psoriasis. Sometimes a biopsy is needed.
There are various treatments that can be used. These include prescribed creams, treatment with liquid nitrogen (cryotherapy), surgery and photodynamic therapy (PDT).