Many times patients confuse seborrheic keratosis with melanoma and go to a doctor for examination. A thorough examination by an experienced doctor is usually a reliable way to tell the difference. Unfortunately, there is a type of melanoma known as verrucous melanoma that can mimic seborrheic keratosis. Fortunately, however, this is an extremely rare event. Secondary procedure - Doing something a second time, usually surgery, e.g., for touching up, to make more nearly perfect or to repair a treatment failure.
Skin is composed of living and dead layers.
The dead layers include the surface scale, outside hair and nail plate. The living layers include the epidermis, dermis, subcutaneous and all of the structures found within those layers, including blood vessels, sweat glands, etc. There are several grades of squamous-cell carcinoma, depending on how unusual the tumor's cells are. Also known as routine excision, it has the same net effect as an excisional biopsy. Excisional biopsy usually implies the process of vertical sectioning, which carries with it an inherent failure rate.