Hello,
Flat warts are benign tumors of the epidermis and usually occur in
children. They are about the size of a pinhead and usually appear on the
face, but can also appear on arms, knees, or hands. Several medications(like podophyllum resin, Podofilox (Condylox), Trichloroacetic and bichloroacetic acids, Imiquimod 5% cream and interferons) are available, which can be applied directly to the surface of the warts.