Dermatoscope image of Bowen's disease on the leg of an 84 year old male patient. This condition, also known as squamous cell carcinoma in situ, is an early form of skin cancer confined to the outer most layer of cells in the skin. It is thought to develop partly as a result of long-term sun exposure and is potentially malignant. The red scaly lesions are removed surgically or destroyed by freezing or cauterisation (heat treatment).