Warts actually do not have 'roots', because the deepest that wart tissue extends in the skin is to something called the basement membrane. This tissue is the bottom layer of the most superficial half of the skin layers, between the epidermis and the dermis. The wart does not extend any further into the skin or the body overall, and therefore does have a 'root' or a 'stalk'. The bottom of the wart is actually shallow and rounded.