Common warts are contagious even without broken skin. Common warts are caused by an infection with a subtype of the human papillomavirus (HPV). The disease is primarily transmitted through contact with each other, and it is not necessary for the surface to have wounds or cuts in order to spread. Therefore, once this disease is detected, it must be treated promptly and properly, such as going to the dermatology department of a hospital to use methods like cryotherapy or laser. It may not be completely cured in one session and might require multiple treatments to fully resolve. Only after it is completely cured and the source of infection is eliminated, will it no longer spread to oneself or others around. It is important to maintain cleanliness and hygiene, and it is advisable not to keep small animals at home.