A corn is actually what is commonly referred to as a typical wart, and this type of common wart is actually caused by a viral infection. When the body's immune system is weakened, such an infection can occur, and it generally has a slight possibility of contagion. Most of the time, treatment of these warts involves localized injections of antiviral medication, or through methods such as laser surgery, which can achieve improvement. On the other hand, a callus is a type of localized proliferative condition, and although it may be caused by a viral infection, the likelihood of it being caused by localized pressure or irritation is greater. Typically, this condition can be improved through physical therapy methods, such as using topical medications to remove it, or by using laser surgery locally as a complementary treatment, achieving better outcomes.