Warts, which are caused by the human papillomavirus, are incredibly common. They aren’t serious, but they can sometimes be uncomfortable (depending on where they are) and embarrassing for older children. A toddler probably won’t pay it much mind. Although they often go away by themselves.
This is widely available in drugstores, both in solutions that can be painted onto the wart and in little acid-soaked pads that are put over the wart and covered with a bandage. They work pretty well, but even with daily use, it can take months before the wart disappears. Rubbing the wart lightly with an emery board before treatment can help. Try to put the medicine only on the wart, and stop for a few days if there is redness or irritation around it.
Place a piece over the wart, and change daily. This sounds weird, but it actually works about as well as salicylic acid.
There have been studies suggesting that rubbing a clove of garlic on the wart every night and then covering it with a bandage can help it go away quicker.
The doctor can use a cotton swab dipped in liquid nitrogen or something similar to freeze off the wart. This is usually painless, but repeated treatments are often needed, and it’s not necessarily more effective than salicylic acid or home therapy.