What is the Scholl Verruca & Wart Treatment Pen and how does it work? The Scholl Verruca & Wart Treatment Pen is a Self-Care Medical Device clinically proven to treat verrucas & warts on hands and feet. The Treatment Pen contains a gel, based on the Active Medical Ingredient TCA-Active™, which induces peeling of the infected skin. The thickened skin and its causative virus are removed and new healthy skin will appear. The one-click pen comes with a precision tip for targeted application. A blue colouring agent is added to the gel to further facilitate precise application and to prevent accidental application to healthy skin. Directions for Use: Read the instructions for use thoroughly: Handle with caution. If you have any questions, consult your general practitioner or pharmacist. Benefits & Features: Clinically proven TCA Active Gel Visible results in 1 week Easy, one-click precision applicator Ingredients: TCA-Active™ (based on Trichloroacetic Acid), Carbopol, Methylene Blue, Aqua