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. What is a Verruca / Wart? Common warts appear on the skin as small, rough \'cauliflower-like\' growths, caused by human papillomavirus (HPV) infection. Common warts occur mostly on hands, fingers or toes Verrucas mainly grow on the soles of the feet or heels and tend to be flatter, harder and are often tender/painful when walking or standing. Who can use the Scholl Verruca & Wart Treatment Pen? The pen can be used by adults and children from 4 years old. During pregnancy or breastfeeding or if you are diabetic, have poor blood circulation or skin diseases it is recommended to consult your general practitioner prior to use.