Inning accordance with the American Academy of Dermatology, a growth is a development that appears on the skin when a very specific infection (called the human papillomavirus, or HPV) infects the leading layer of the skin. The infection usually enters a cut or sore in the surface of the skin prior to producing the development.
The growth itself can take on the appearance of a tiny piece of cauliflower or a sore. The majority of protuberances last just a few moths prior to disappearing. Some verrucas could last for years if neglected.